[Backport 7.71.x] Use bitnamilegacy images to fix CI

[datadog-agent-integrations-bot]

Backport ff505f8 from #21467.

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What does this PR do?

Use bitnamilegacy images for E2E environments

Motivation

bitnami images were removed: bitnami/charts#35164
the images are available from bitnamilegacy but they won't be updated, so we will need to migrate to a different source soon

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@46f6880). Learn more about missing BASE report.

Additional details and impacted files

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