Add Rich Nav specific pipeline, temporarily add to ci for testing (#26822)

* Add Rich Nav specific pipeline, temporarily add to ci for testing
* Add Rich Code Navigation feed to Nuget.config
* Temporarily disable package reference restrictions
* Try running Rich Nav task directly
* Fix typo
* Temporarily update rich nav task to verify successful run
* Remove Rich Nav code from regular CI
* Remove unnecessary args from Rich Nav build, add language variable
* Apply fixes to Rich Nav pipeline
* Remove specific binary log build args, stop disabling package reference restrictions
* HACK HACK HACK replace existing CI with rich nav CI to test
* Begin publishing artifacts to start debugging empty files
* Explicitly set environment variable for rich navigation
* Publish binlogs
* Try manually updating arcade sdk to get new rcn package
* Upload logs even if we've failed (hopefully they exist!)
* Add RCN task to run on succeeded or failed to see what happens!
* Remove parameters that aren't defined
* Final rich nav test/assertion
* Replace normal CI and finalize Rich Nav CI script