[Backport 7.71.x] Disable Vertica tests that use the missing docker image.

[datadog-agent-integrations-bot]

Backport 336c4cf from #21675.

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What does this PR do?

Disable Vertica tests that use the missing docker image (integration and E2E).
There might be less repetitive ways to disable them, but this hopefully minimizes reader surprise.

Motivation

Reduce failed test noise in our CI.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (7.71.x@8074918). Learn more about missing BASE report.

Additional details and impacted files

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