[release/9.0] Treat rtm as stable workload band

[lewing]

see discussion at dotnet/sdk#43554

[lewing]

/backport to main

[github-actions]

Started backporting to main: https://github.com/dotnet/emsdk/actions/runs/10929566508

[github-actions]

@lewing backporting to main failed, the patch most likely resulted in conflicts:

$ git am --3way --empty=keep --ignore-whitespace --keep-non-patch changes.patch

Applying: Treat rtm as stable workload band
Using index info to reconstruct a base tree...
M	eng/Versions.props
M	eng/nuget/Microsoft.NET.Runtime.Emscripten.Common.props
Falling back to patching base and 3-way merge...
Auto-merging eng/nuget/Microsoft.NET.Runtime.Emscripten.Common.props
CONFLICT (content): Merge conflict in eng/nuget/Microsoft.NET.Runtime.Emscripten.Common.props
Auto-merging eng/Versions.props
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"
Patch failed at 0001 Treat rtm as stable workload band
Error: The process '/usr/bin/git' failed with exit code 128

Please backport manually!

[github-actions]

@lewing an error occurred while backporting to main, please check the run log for details!

Error: git am failed, most likely due to a merge conflict.