Announcement: develop and main branch renames

[jander-msft]

In order to be more consistent with typical branch naming the following branches will be renamed:

• main -> release
• develop -> main

The main branch will become the default branch.

This transition will be done by:

• Lock the develop branch from accepting any changes.
• Update the main branch yaml pipelines to trigger on new branch names.
• Create a new release branch from the current main branch.
• Update Azure DevOps pipelines and release definitions and GitHub policies with new branch names.
• Merge the develop branch into the main branch.
• Delete the develop branch after verifying all builds and triggers are correct.

This transition is planned to start on Thursday, July 15th and to be completed on Friday, July 16th.

[jander-msft]

This work is completed and the default branch has been changed to main. Releases are now performed out of the release branch.