🌸[6.0][Concurrency] Remove _unsafeInheritExecutor from public APIs, use #isolation #72830
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Description: In order to avoid isolation boundary warnings when task groups are used inside (global) actors we need to inherit isolation contest to most of their async APIs. Specifically, this PR resolves next() and waitForAll() now inheriting caller isolation.
Without this fix, the added test case would have failed with:
Risk: Low, because all existing ABI entrypoints are retained.
Review by: @hborla
Testing: CI testing
Original PR: #72794 #72578 #72862
Radar: rdar://122846553Otherwise we get warnings when task groups are used within an actor.
Add global actor tests to cover the specific situation.
resolves rdar://122846553