Add new channels for SDK

[Forgind]

To double check:

• The right tests are in and and the right validation has happened. Guidance: https://github.com/dotnet/arcade/tree/main/Documentation/Validation

[MilenaHristova]

/backport to release/8.0

[github-actions]

Started backporting to release/8.0: https://github.com/dotnet/arcade/actions/runs/7624258939

[github-actions]

@MilenaHristova an error occurred while backporting to release/8.0, please check the run log for details!

Error: @MilenaHristova is not a repo collaborator, backporting is not allowed. If you're a collaborator please make sure your dotnet team membership visibility is set to Public on https://github.com/orgs/dotnet/people?query=MilenaHristova

[premun]

/backport to release/8.0

[github-actions]

Started backporting to release/8.0: https://github.com/dotnet/arcade/actions/runs/7624299519

[github-actions]

@premun backporting to release/8.0 failed, the patch most likely resulted in conflicts:

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

Applying: Add new channels
Using index info to reconstruct a base tree...
M	src/Microsoft.DotNet.Build.Tasks.Feed/src/model/PublishingConstants.cs
Falling back to patching base and 3-way merge...
Auto-merging src/Microsoft.DotNet.Build.Tasks.Feed/src/model/PublishingConstants.cs
CONFLICT (content): Merge conflict in src/Microsoft.DotNet.Build.Tasks.Feed/src/model/PublishingConstants.cs
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Add new channels
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".
Error: The process '/usr/bin/git' failed with exit code 128

Please backport manually!

[github-actions]

@premun an error occurred while backporting to release/8.0, please check the run log for details!

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