[6.2] Fix diagnostic messages for some cases of invalid lifetime depenndencies #81916
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Explanation: This PR fixes some diagnostic messages involving lifetime dependencies that were misleading and suggested an invalid alternative.
Scope: Limited to LifetimeDependence experimental feature
Resolves: rdar://151810577
Main PR: #81893
Risk: None. Rephrasing diagnostic messages
Testing: Added compiler tests
Reviewer: @atrick