* Update branding to 6.0.9

* [release/6.0] Move builds to MacOS 11
- hosted macOS-10.15 environment is deprecated

* Use an installed XCode version

Co-authored-by: Doug Bunting <6431421+dougbu@users.noreply.github.com>

Merging internal commits for release/6.0

Bumps [src/submodules/googletest](https://github.com/google/googletest) from `548b13d` to `96f5142`.
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](https://github.com/google/googletest/compare/548b13dc3c02b93f60eeff9a0cc6e11c1ea722ca...96f51426e4c776a71d0a446c1e4f4c7a5ea921df

)

---
updated-dependencies:
- dependency-name: src/submodules/googletest
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* [release/6.0] Remove more unused Docker files
- clean up the old SystemdActivation files
- follow-up work that's similar to c5c8f438

* [release/6.0] Give up on Build.Server.Amd64.VS2019.BT.Open
- `cherry-pick` part of 0394ac7b
- was "Try out 1es images (#41400)"

Co-authored-by: Brennan <brecon@microsoft.com>
Co-authored-by: William Godbe <wigodbe@microsoft.com>

* Update branding to 6.0.8

* release/6.0] Give up on Build.Server.Amd64.VS2019.BT.Open

- `cherry-pick` part of 0394ac7b
- was "Try out 1es images (#41400)"

Co-authored-by: Doug Bunting <6431421+dougbu@users.noreply.github.com>

Merged PR 23388: [internal/release/6.0] Update dependencies from dnceng/internal/dotnet-efcore dnceng/internal/dotnet-runtime

This pull request updates the following dependencies

[marker]: <> (Begin:1ac68a20-28fc-4e11-3a4d-08d961c5a689)
## From https://dev.azure.com/dnceng/internal/_git/dotnet-efcore
- **Subscription**: 1ac68a20-28fc-4e11-3a4d-08d961c5a689
- **Build**: 20220615.1
- **Date Produced**: June 15, 2022 9:41:06 AM UTC
- **Commit**: 5f5283806774a7fd1bbe2ec54736dc8a5d30c16d
- **Branch**: refs/heads/internal/release/6.0

[DependencyUpdate]: <> (Begin)

- **Updates**:
  - **dotnet-ef**: [from 6.0.6 to 6.0.7][10]
  - **Microsoft.EntityFrameworkCore**: [from 6.0.6 to 6.0.7][10]
  - **Microsoft.EntityFrameworkCore.Design**: [from 6.0.6 to 6.0.7][10]
  - **Microsoft.EntityFrameworkCore.InMemory**: [from 6.0.6 to 6.0.7][10]
  - **Microsoft.EntityFrameworkCore.Relational**: [from 6.0.6 to 6.0.7][10]
  - **Microsoft.EntityFrameworkCore.Sqlite**: [from 6.0.6 to 6.0.7][10]
  - **Microsoft.EntityFrameworkCore.SqlServer**: [from 6.0.6 to 6.0.7][10]
  - **Microsoft.EntityFrameworkCore.Tools**: [from 6.0.6 to 6.0.7][10]

[10]: https://dev.azure.com/dnceng/internal/_git/dotnet-efcore/branches?baseVersion=GC796d2f8&targetVersion=GC5f52838&_a=files

[DependencyUpdate]: <> (End)

[marker]: <> (End:1ac68a20-28fc-4e11-3a4d-08d961c5a689)

[marker]: <> (Begin:7745f62d-e15b-4ba3-39b3-08d960f4ca81)
## From https://dev.azure.com/dnceng/internal/_git/dotnet-runtime
- **Subscription**: 7745f62d-e15b-4ba3-39b3-08d960f4ca81
- **Build**: 20220622.2
- **Date Produced**: June 22, 2022 2:36:52 PM UTC
- **Commit**: 0ec02c8c96e2eda06dc5b5edfdbdba0f36415082
- **Branch**: refs/heads/internal/release/6.0

[DependencyUpdate]: <> (Begin)

- **Updates**:
  - **Microsoft.Internal.Runtime.AspNetCore.Transport**: [from 6.0.6-servicing.22267.7 to 6.0.7-servicing.22322.2][12]
  - **Microsoft.NET.Runtime.MonoAOTCompiler.Task**: [from 6.0.6 to 6.0.7][12]
  - **Microsoft.NET.Runtime.WebAssembly.Sdk**: [from 6.0.6 to 6.0.7][12]
  - **Microsoft.NETCore.App.Ref**: [from 6.0.6 to 6.0.7][12]
  - **Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.browser-wasm**: [from 6.0.6 to 6.0.7][12]
  - **Microsoft.NETCore.App.Runtime.win-x64**: [from 6.0.6 to 6.0.7][12]
  - **Microsoft.NETCore.BrowserDebugHost.Transport**: [from 6.0.6-servicing.22267.7 to 6.0.7-servicing.22322.2][12]
  - **Microsoft.NETCore.Platforms**: [from 6.0.4 to 6.0.5][12]

[12]: https://dev.azure.com/dnceng/internal/_git/dotnet-runtime/branches?baseVersion=GC7cca709&targetVersion=GC0ec02c8&_a=files

[DependencyUpdate]: <> (End)

[marker]: <> (End:7745f62d-e15b-4ba3-39b3-08d960f4ca81)

* Update dependencies from https://github.com/dotnet/arcade

 build 20220614.7

Microsoft.DotNet.Arcade.Sdk , Microsoft.DotNet.Build.Tasks.Installers , Microsoft.DotNet.Build.Tasks.Templating , Microsoft.DotNet.Helix.Sdk
 From Version 6.0.0-beta.22261.7 -> To Version 6.0.0-beta.22314.7

Co-authored-by: dotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>
Co-authored-by: Doug Bunting <6431421+dougbu@users.noreply.github.com>

Merging internal commits for release/6.0

- reenable baseline validation
- update downlevel runtime versions
- update 3.1 site extension package version

- get latest versions

Co-authored-by: William Godbe <wigodbe@microsoft.com>

* Fix branch names again

* Update azure-pipelines-mirror-within-azdo.yml

* Update azure-pipelines-mirror-within-azdo.yml

Co-authored-by: William Godbe <wigodbe@microsoft.com>

[release/6.0] Work around #41937 and stop skipping tests

- tests look green with workaround in place
- partially revert "Update branding to 6.0.7 (#42078)"
- was commit 78f64d8e

- unset `ASPNETCORE_ENVIRONMENT` on Helix agents

Co-authored-by: William Godbe <wigodbe@microsoft.com>

- manual backport of #42029
- avoid problems caused by an undocumented dependency in the Helix SDK on the Arcade SDK
- symptoms were a complete lack of retries in our Helix work items

* Fix line endings for SPA proxy script on MacOS

* Update SpaProxyLaunchManager.cs

* Fix conflicts

* Fixup

* Fixup

* Update src/Middleware/HttpLogging/test/FileLoggerProcessorTests.cs

Co-authored-by: Benedikt <benedikt.achatz@gmail.com>
Co-authored-by: Doug Bunting <6431421+dougbu@users.noreply.github.com>

Bumps [src/submodules/googletest](https://github.com/google/googletest) from `8ded48c` to `548b13d`.
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](https://github.com/google/googletest/compare/8ded48c37be09d8cc3665af1b414c5d53c0862e7...548b13dc3c02b93f60eeff9a0cc6e11c1ea722ca

)

---
updated-dependencies:
- dependency-name: src/submodules/googletest
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* Backport 39275 to release/6.0

* Cache appcontext switch value

* PR feedback