Use CDN URL instead of blob in FindDotNetCliPackage

[akoeplinger]

Noticed this while looking at #16329, I think we shouldn't use the blob storage here either.

To double check:

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

[mmitche]

/backport to release/10.0

[mmitche]

/backport to release/9.0

[github-actions]

Started backporting to release/10.0 (link to workflow run)

[mmitche]

/backport to release/8.0

[github-actions]

Started backporting to release/9.0 (link to workflow run)

[github-actions]

Started backporting to release/8.0 (link to workflow run)

[github-actions]

@mmitche backporting to release/9.0 failed, the patch most likely resulted in conflicts. Please backport manually!

git am output

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

Applying: Use CDN URL instead of blob in FindDotNetCliPackage
Using index info to reconstruct a base tree...
M	src/Microsoft.DotNet.Helix/Sdk/FindDotNetCliPackage.cs
Falling back to patching base and 3-way merge...
Auto-merging src/Microsoft.DotNet.Helix/Sdk/FindDotNetCliPackage.cs
CONFLICT (content): Merge conflict in src/Microsoft.DotNet.Helix/Sdk/FindDotNetCliPackage.cs
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 set advice.mergeConflict false"
Patch failed at 0001 Use CDN URL instead of blob in FindDotNetCliPackage
Error: The process '/usr/bin/git' failed with exit code 128

Link to workflow output