fix gvt failure in some locales by overriding to utf8

[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".

Fixes #29665

[nijoj]

#build

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[nijoj]

!GVT
artifact_execution_id=_vKvx4XTmEe-ZBdXWdK7Miw
bucket_image_artifact_execution_id=_vFVGYHTmEe-ZBdXWdK7Miw

[nijoj]

!GVT
artifact_execution_id=_vKvx4XTmEe-ZBdXWdK7Miw

[seethalm]

!GVT
artifact_execution_id=_pQxRUHTnEe-ZBdXWdK7Miw
bucket_image_artifact_execution_id=_vFVGYHTmEe-ZBdXWdK7Miw

[nijoj]

#build

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[nijoj]

!build
git.clone.repository.username=nijo
git.clone.repository.branch=32727-fixGvtUiTest
fat.buckets.to.run=all

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[nijoj]

!build
git.clone.repository.username=nijo
git.clone.checkout.branch=32727-fixGvtUiTest
fat.buckets.to.run=all

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[websterc87]

LGTM. Passing in GVT and PB.
This should work across the board but Iseries and ZOS failures are worth looking out for.

[seethalm]

#run-libby-bot

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Code analysis and actions

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

• 1 test infrastructure code files were changed.

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

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[wraschke]

@nijoj this is causing hard break 302151.