Improvements to tests relating to when FIPS140-3 is enabled

[abutch3r]

Covers a known z/OS test that have different characteristics to distributed

skip some tests that should not be run on Java 8 anyway

Expand sources that FIPS enablement in Liberty Client checks to include envvars.

• I have considered the risk of behavior change or other zero migration impact (https://github.com/OpenLiberty/open-liberty/wiki/Behavior-Changes).
• If this PR fixes an Issue, the description includes "Fixes #FILLMEIN" or "Resolves #FILLMEIN" (verify release bug label if applicable: https://github.com/OpenLiberty/open-liberty/wiki/Open-Liberty-Conventions).
• If this PR resolves an external Known Issue (including APARS), the description includes "Fixes #FILLMEIN" or "Resolves #FILLMEIN".

[abutch3r]

!build (view Open Liberty Personal Build - ⏳InProgress)

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[LibbyBot]

Code analysis and actions

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• 3 FAT files were changed, added, or removed.

• Check that the build did not break the affected FAT suite(s).

• 1 test infrastructure code files were changed.

• Test failures/errors in the build could be due to these changes.

• Please describe in a separate comment how you tested your changes.