Add retries to Azure Devops Reporter scripts

[MattGal]

#7371 - retry in the case of HTTP 503 (10x, 3 seconds between attempts) , and stop trying in the case of "run is deleted"

To double check:

• The right tests are in and and the right validation has happened. Guidance: https://github.com/dotnet/core-eng/tree/master/Documentation/Validation (this script, at least the success path, is exercised in Helix PR validation)

• Regular log from the run below exercising this change

Formatting changes were from me letting pycharm format the script; logging change is to be sure I'm testing what I changed.

[MattGal]

There's one last error I didn't handle, TF400813: The user '' is not authorized to access this resource, which could be added to the cases but it's kind of artificial (happens when you rerun a finished job with its token hours later)