Harden xunit-reporter.py against hangs in upload_blob

[MattGal]

• This issue is blocking
• This issue is causing unreasonable pain

As noted in this PR: dotnet/runtime#39153
It seems that our storage client options are hitting Azure/azure-sdk-for-python#11437 .

• We might be able to work around this by upping the Helix azure-storage-blob version to 12.3.2 from 12.0.0 (that'd be a change in dotnet-helix-machines)
• Otherwise we should look into providing a timeout mechanism here for retries, as the file in question was actually quite small and if the upload_blob() call hadn't hung a retry would have been quite fast.

[MattGal]

@AlitzelMendez can this be closed? If it's merged in Arcade for this long it's in use.

[AlitzelMendez]

yes, it is already merged. closing the issue