Adjust BWC candidates in retention lease BWC tests #40562
Merged
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We test BWC with nodes older than 6.7.0 since such nodes would not understand retention lease sync requests. However, we do not need to test compatibility with nodes on or after 6.7.0 since we know these nodes understand retention lease sync requests, which are already exercised in other tests. Therefore, we can skip these versions when running the BWC tests and only test against versions that do not understand retention lease sync requests.
Closes #40559
Relates #40561