fix: remove must-gather E2E test

[mateusoliveira43]

Why the changes were made

With the updates from #1487, must-gather E2E test will break. It will be updated to work on master and oadp-1.4 branch, but removed from other branches, as no new development tags will be created for those branches.

How to test the changes made

TODO

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This pull-request has been approved by: mateusoliveira43

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[openshift-merge-robot]

PR needs rebase.

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