Wait for MAR images to match expected go version

[dagood]

• Resolves Automatically run sanity tests after the release process before announcement go#1090

This is only intended as a broad check. If we're trying to ship 1.21.5-1 and the image contains 1.210.5, then something went seriously wrong, and this would catch it. This PR changes it from a manual step to an automated one.

Test run: https://dev.azure.com/dnceng/internal/_build/results?buildId=2510014&view=results
I tested the polling case manually, locally, with versions that don't exist.

The value of this check is limited: go version only outputs 1.21.5, so if we're building 1.21.5-2 that replaces 1.21.5-1, it will potentially succeed too early. But, this limitation has always been there--this PR only automates the check, making it clearer that the potential problem exists.

• Related: go version should inform that the go binary is generated by microsoft  go#262
• This PR isn't good enough as a way to generally make sure MAR has all our images. We actually should set up this .NET Docker feature: Implement waitForIngestionEnabled for go-images go#1258

Also fixes the pipeline: it was ignoring runPublishAnnouncement.

[mertakman]

I've reviewed your code and have a few suggestions for making it cleaner and more precise. These are minor nitpicks, but I believe they'll enhance the overall quality of the code.

[mertakman]

Looks good to go