[region-isolation] Simplify the code for use after transfer errors. #72140
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Specifically, we previously would generate a list of errors to emit and then have one centralized piece of code that went through the list and emitted them. Instead, we now have a low level emitter struct that is just used to emit the diagnostic at the immediate point where we would create previously an error record. This places the diagnostic emission next to the piece of code that triggered it being emitted making it easier to debug why an error was emitted using -Xllvm -swift-diagnostics-assert-on-*.
I am going to do the same for transfer non transferrable in a little bit once the async let patch has landed. It has some transfer non transferable error additions that I want to get in so I am going to wait on that.
NFCI.