Ensure annot_macros tests run on Windows

[markcmiller86]

Description

This ensures the annot_macros.py will run on Windows also.

I also made some missing adjustments to python 2/3 coding logic in visit_test_main.py and made azure-pipelines.yml a little cleaner.

Type of change

• [x] Bug fix~~
• [ ] New feature
• [ ] Documentation update
• [ ] Other

How Has This Been Tested?

Reminders:

• Please follow the style guidelines of this project.
• Please perform a self-review of your code before submitting a PR and asking others to review it.
• Please assign reviewers (see VisIt's PR procedures for more information).

Checklist:

• [x] I have commented my code where applicable.~~
• [ ] I have updated the release notes.
• [ ] I have made corresponding changes to the documentation.
• [ ] I have added debugging support to my changes.
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [ ] I have confirmed new and existing unit tests pass locally with my changes.
• [ ] I have added new baselines for any new tests to the repo.
• [x] I have NOT made any changes to protocol or public interfaces in an RC branch.~~

[markcmiller86]

FYI...I did ensure that the finally: block does indeed reliably remove the files even if the test is ctrl-C'd. I did this by running the test up to the tafile() block and then killing the viewer with a kill -9 and the examining the test data dir for those files.

[markcmiller86]

In 2461534 I adjusted the with and for logic for the two files being used there to make it cleaner.