Testing: Run ops_agent_test on a few newer distros

[martijnvans]

Description

Looks like image_lists.gcl is pretty out of date when it comes to versions of SLES 15 SAP, and while I was at it, I fixed an old TODO about Windows.

Related issue

b/305026436, tangentially

How has this been tested?

automated tests will trigger the Windows change. The SLES was tested (and passed in an earlier draft of this PR.

Checklist:

• Unit tests
  • Unit tests do not apply.
  • Unit tests have been added/modified and passed for this PR.
• Integration tests
  • Integration tests do not apply.
  • Integration tests have been added/modified and passed for this PR.
• Documentation
  • This PR introduces no user visible changes.
  • This PR introduces user visible changes and the corresponding documentation change has been made.
• Minor version bump
  • This PR introduces no new features.
  • This PR introduces new features, and there is a separate PR to bump the minor version since the last release already.
  • This PR bumps the version.