feat: add details to Diagnostics

Laura Ionelrequested to merge
lauraionel/addDiagnosticsDetails into main

Description

The Diagnostics page shows more details in cases where the backend check resulted in an exception.

Related Issues

gitlab-org/editor-extensions/gitlab-lsp#2385 (closed)

gitlab-org/editor-extensions/gitlab-lsp!3373 (merged)

How has this been tested?

Tested this LS MR: gitlab-org/editor-extensions/gitlab-lsp!3373 (merged)

Simulated an exception to see the details in the Diagnostics page:

Screenshot 2026-05-21 at 12.16.48.png

  • If src/browser or src/common has been modified, please consider interoperability with the Web IDE. See Running the Extension in WebIDE.
  • Consider an end-to-end test for significant new features that aren't covered by integration tests.

Screenshots (if appropriate)

What CHANGELOG entry will this MR create?

  • fix: Bug fix fixes - a user-facing issue in production - included in changelog
  • feature: New feature - a user-facing change which adds functionality - included in changelog
  • BREAKING CHANGE: (fix or feature that would cause existing functionality to change) - should bump major version, mentioned in the changelog
  • None - other non-user-facing changes

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