Fix trace diagnostic typo names

[liurenfeng94-ops]

Fixes a couple of internal typo names in trace diagnostics.

This renames clearTaceDiagnostics to clearTraceDiagnostics and toDiagnistic to toDiagnostic. There is no behavior change; this is just cleanup around names that are otherwise easy to copy forward.

Validation:

• pnpm vitest run
• pnpm typecheck
• pnpm exec eslint .
• pnpm build

[github-actions]

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[liurenfeng94-ops]

Thanks — I checked this again. The PR is intentionally just a small internal rename for two misspelled identifiers; runtime behavior is unchanged.