Fix "status.diskusage" and exclude some tests to run when testing Salt Bundle

[meaksh]

What does this PR do?

This PR fixes an issue with status.diskusage function and also exclude tests that are failing when running with Salt Bundle, as tests needs to be adapted.

Since the same tests are working fine for the classic package, we do not exclude them completely via skiplist.

• Upstream PR: https://github.com/saltstack/salt/pull/66647 (Only some commits from this PR make sense upstream)

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• [ ] Docs
• [ ] Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• [x] Tests written/updated

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Yes

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