issue #29780: reintroduce fix for GVT failure

[nijoj]

• 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".

Previous fix was reverted due to issues with running in Z/OS. Fixed it by adding guard code for Z/OS.

Fixes #29780 #29665

[nijoj]

#build
spawn.zos=true
git.clone.repository.username=nijo
git.clone.checkout.branch=32727-fixGvtUiTest
fat.buckets.to.run=all

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[nijoj]

#build
spawn.zos=true
git.clone.repository.username=nijo
git.clone.checkout.branch=32727-fixGvtUiTest
fat.buckets.to.run=all

[LibbyBot]

Your personal pipeline request is at https://libh-proxy1.fyre.ibm.com/cognitive/pipelineAnalysis.html?uuid=131224c7-371a-42ff-8de2-de9da43e4ac8

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