[dds/dap] Extract error messages from ErrorRefs for Watch window evaluation
A recent change somewhere caused some Dart-Code tests to fail. The expression "DateTime.now().ye" used to fail to compile and resulted in a failed RCP call to the VM service ("Expression compilation error") but now it returns a valid result that is a `vm.ErrorRef`.
This applies the same regex to the error message in this path to extract the most useful part of the error text when in the "watch" context so that the visible part of the message is not just "Unhandled exception".
Fixes https://github.com/Dart-Code/Dart-Code/issues/5759
Change-Id: I2933f9d811ec28446f4d2a857c1fd5bd18c94816
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/456241
Reviewed-by: Helin Shiah <helinx@google.com>
Reviewed-by: Ben Konyi <bkonyi@google.com>
Commit-Queue: Ben Konyi <bkonyi@google.com>
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