Move gemnasium-maven thunderbird integration test into a separate job

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Summary

gitlab-org/security-products/analyzers/gemnasium!674 (comment 1834360055) mentioned:

I wonder if we can improve this by updating the ParallelGroupExtractor to move the new rspec example into a completely separate job within the image test only slow scans parent. In any case, I think the current increase in pipeline execution time is acceptable, so we can investigate this optimization in a follow-up issue.

Improvements

Decrease the overall time it takes to run the gemnasium-maven pipeline.

Risks

TBD

Involved components

TBD

Optional: Intended side effects

Optional: Missing test coverage

/cc @philipcunningham @adamcohen