compatibility for new progressbar rendering

[mawinter69]

previously it was table, now it is a (theoretically it can also be div but not for the build history).
See jenkinsci/jenkins#8821

Testing done

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4. Link to relevant issues in GitHub or Jira
5. Link to relevant pull requests, esp. upstream and downstream changes
6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

[raul-arabaolaza]

None of the test failures here are new and were already falling in previous runs of master. So I believe this will need to be merged manually.

I am checking the test failures just in case I can find an easy fix as the root cause looks limited

[raul-arabaolaza]

I found no relationship between this change and the test failures, this can be merged IMO.