Move bitnami image used for testing to bitnami legacy

[AAraKKe]

What does this PR do?

Modify the repo used by the velero helm chart from the bitnami one to bitnami legacy. This is not a final solution but VMware Tanzu is still discussing a final alternative to the bitnami image.

See: vmware-tanzu/helm-charts#698

Motivation

Do not rely on bitnami images for testing.

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

[github-actions]

⚠️ The qa/skip-qa label has been added with shippable changes

The following files, which will be shipped with the agent, were modified in this PR and
the qa/skip-qa label has been added.

You can ignore this if you are sure the changes in this PR do not require QA. Otherwise, consider removing the label.

List of modified files that will be shipped with the agent

velero/changelog.d/21274.fixed
velero/pyproject.toml

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.00%. Comparing base (598ba54) to head (bb64ff6).

Additional details and impacted files

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[AAraKKe]

I took ages for the test to finish and eventually it failed. But it can run properly locally. I will keep looking into this on Monday.