[Concurrency] Remove -disable-region-based-isolation-with-strict-concurrency
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#74567
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This flag was used as a staging mechanism for enabling
RegionBasedIsolation
by default under-strict-concurrency=complete
without having to update all of the tests, and it's only available in asserts compiler builds. Now that SE-0414 is implemented for Swift 6.0, it's not valuable to continue to run tests without it, and removing the flag is helpful for moving forward with improvements to the concurrency diagnostics without needing to handle test configurations that users will never experience.