AST: Narrow the filtering of unavailable conformances to Sendable only [5.7] #59454
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Remove the allowUnavailable parameter to lookupConformance(), and instead
explicitly check the result for hasUnavailableConformance() in the places
where we used to pass 'false'.
Also, narrow down this check in those places to the Sendable protocol
only, fixing a regression with Hashable conformance synthesis.
Fixes rdar://problem/94460143.