[5.10][Concurrency] Disallow Sendable annotation on methods of non-Sendable… #69220
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Cherry-pick #69177 into release/5.10
Explanation: Diagnose Sendable annotation on methods of non-Sendable types. This will be an error in Swift 6.
Risk: Low, diagnostic
Testing: Passes current test-suite
Reviewer: @hborla @slavapestov