chore: Enables TestAccBackupSnapshotExportJob_basic for test runs.

[marcosuma]

Description

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Further comments

[lantoli]

note that a couple of tests are failing

[marcosuma]

@lantoli backup tests are being flaky in the last days 😢 I am making sure the test I am changing are succeeding, and overall what I notice is that it's not always the same test that are failing.

@EspenAlbert I agree, but consider that a test written this way has the advantage of being hermetic. I think overall though that within the backup test suite we're testing almost always the same thing, hence some tests might be duplicate.