[release/7.0] Move to an RTM SDK (#44233)

* [release/7.0] Move to an RTM SDK
* Update global.json
* Update global.json
* Grab part of #43802
  - `cherry-pick`ed from d184b978

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