Convert expression evaluation exceptions to errors

[annagrin]

Description

Expression evaluation for web currently throws an exception if frontend server has an internal error. Convert those exceptions to errors instead so IDEs can display or ignore them better, depending on where the expression was evaluated directly or via hovering over (or other scenarios).

This change is part of three changes (flutter, webdev, sdk) needed to convert exceptions to errors, all of which are needed to fix #54520

• DWDS version 3.0.3 that propagates the errors instead of exceptions:
  better scope detection and error handling in expression evaluator dart-lang/webdev#954
  Updated the dependency to match.

• SDK change (in progress) to convert some exceptions to errors so recoverable failures in expression evaluation do not crash frontend server:
  https://dart-review.googlesource.com/c/sdk/+/143660

Related Issues

#54520

Tests

I added the following tests:

packages/flutter_tools/test/general.shard/web/web_expression_compiler_test.dart

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[jonahwilliams]

You'll need to use flutter update-packages --force-upgrade to update dwds`

[jonahwilliams]

LGTM with nits

[jonahwilliams]

Still LGTM