Remove capabilities flags related to unsupported SDKs, and prune dead code - #5976

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 67.52%. Comparing base (ebd5410) to head (41166f3).

@@            Coverage Diff             @@
##           master    #5976      +/-   ##
==========================================
+ Coverage   67.51%   67.52%   +0.01%     
==========================================
  Files         169      169              
  Lines       12974    12963      -11     
  Branches     2566     2565       -1     
==========================================
- Hits         8759     8753       -6     
+ Misses       3756     3752       -4     
+ Partials      459      458       -1     

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@codex review

/gemini review

Thank you for invoking /gemini review. This pull request streamlines the codebase by removing obsolete capability flags and associated dead code, particularly those related to older Dart Debug Adapter Protocol (DAP) distinctions and certain web capabilities. Codecov Report Issue: The Codecov report highlights a missing coverage line in src/shared/capabilities/dart.ts. This indicates a potential gap in test coverage, possibly due to a test no longer covering a modified line, or an attempt to access a capability that has been removed or refactored. Please investigate this to ensure all relevant code paths are adequately tested and that no regressions are introduced by the removal of these flags. Severity: low

Codex Review: Didn't find any major issues. Already looking forward to the next diff.