feat: add VRT environment variables to frontend workflows for visual regression testing

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.github/workflows/frontend-deploy-workflow.yml

Activity based on git-commit:

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MAR	47 additions & 26 deletions
FEB	374 additions & 9 deletions
JAN	9 additions & 1 deletions
DEC	292 additions & 12 deletions
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.github/workflows/frontend-pr-workflow.yml

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MAR	55 additions & 27 deletions
FEB	273 additions & 92 deletions
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DEC	458 additions & 16 deletions
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