[6.0][region-isolation] Change capturing a value into an async let that is not further sent into an actor isolated function to use a new style error. #74879
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Explanation: This PR cleans up the async let diagnostic so that we emit a new style "named" error instead of a type based error.
Radars:
Original PRs:
Risk: Low. Just modifies a diagnostic to improve readability and quality of implementation.
Testing: Added tests to the compiler.
Reviewer: @ktoso