[6.2][Test][Concurrency] Fix isIsolatingCurrentContext tests #80747
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Description:
These tests can fail when testing on an older OS version than the one that will ship with Swift 6.2. Fix by disabling availability checking.
Details: Since tests may run on an OS that correspond to an older Swift runtime, and if the build has real availability values and not the 9999 hardcoded ones, the
#if available
test will fail, and thus not execute the code guarded by it. The CHECK lines are still checked, and since no code executed, these will all fail.Scope/Impact: Test only change
Risk: Low, test only
Testing: Verified the tests
Reviewed by: @ktoso (I reviewed, this is @al45tair's patch)
Original PR: #80720
Radar: rdar://148986812