[6.1]Revert [ConformanceLookup] Don't allow skipping inherited unavailable conformances in favor of explicit available ones.#79596

Merged

hborla merged 6 commits intoswiftlang:release/6.1from

hborla:6.1-revert-unavailable-superclass-sendable-conformance

Feb 26, 2025

Commits on Feb 25, 2025

Revert "[NFC][Copyable] Update an expected error to a warning."
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Revert "[Conformance] Always downgrade redundant conformances to marker protocols to"
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Revert "[ProtocolConformance] Compute the correct un-availability for inherited"
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Revert "[ConformanceLookup] Just kidding, the compiler needs to prefer available"
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Revert "[ConformanceLookup] Always prefer unavailable Sendable conformances from the"
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Revert "[ConformanceLookup] Don't allow skipping inherited unavailable conformances"
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