Fix getWorkspaceProblems to use an await

[mrubens]

Fix issue where @problems wasn't working, follow-up to #996

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Important

Fixes asynchronous handling of getWorkspaceProblems in parseMentions to ensure correct workspace diagnostics fetching.

• Behavior:
  • Fixes issue in parseMentions in index.ts where getWorkspaceProblems was not awaited, causing potential asynchronous issues.
  • Ensures problems mention correctly fetches and appends workspace diagnostics.

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Latest commit: c7868cf

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