fix(itest): fix GraphQLTest.java (backport #395)

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Based on: #294 Continuation of: #316

Description of the change:

This change allows an environment variable to be configured so that...

Motivation for the change:

This change is helpful because users may want to...

How to manually test:

1. Run CRYOSTAT_IMAGE=quay.io... bash smoketest.bash...
2. ...

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   This is an automatic backport of pull request #395 done by Mergify.

[andrewazores]

/build_test

[github-actions[bot]]

Workflow started at 6/26/2024, 1:47:24 PM. View Actions Run.

[github-actions[bot]]

No GraphQL schema changes detected.

[github-actions[bot]]

No OpenAPI schema changes detected.

[github-actions[bot]]

CI build and push: All tests pass ✅ (JDK17) https://github.com/cryostatio/cryostat/actions/runs/9684337798