feat(build): skip merging coverage results as Codecov do this automatically

[hainenber]

User description

feat(build): skip merging coverage results as Codecov do this automatically

SUMMARY

Chore PR to delegate merging code coverage results from shared tests to CodeCov. No need for nyc to do this anymore.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

Code coverage result is still present after this PR takes place.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

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CodeAnt-AI Description

Skip merging frontend coverage artifacts and upload raw coverage directory to Codecov

What Changed

• CI no longer runs a step to merge per-shard coverage files; the workflow uploads the collected coverage directory directly to Codecov
• Removed an unused nyc TypeScript config dev dependency from the frontend package, and trimmed related packaged entries from lockfile
• Coverage reports remain produced by tests and are still uploaded, but no local merge output is required

Impact

✅ Fewer CI steps for frontend coverage
✅ Shorter frontend CI runs
✅ Fewer coverage merge errors

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[bito-code-review]

Bito Automatic Review Skipped - Files Excluded

Bito didn't auto-review this change because all changed files are in the exclusion list for automatic reviews. No action is needed if you didn't intend for the agent to review it. Otherwise, to manually trigger a review, type /review in a comment and save.
You can change the excluded files settings here, or contact your Bito workspace admin at evan@preset.io.

[hainenber]

Coverage result is still successfully uploaded to CodeCov (link)

[codeant-ai-for-open-source]

Sequence Diagram

This PR removes the local merging of per-shard frontend coverage results in CI and instead uploads the collected coverage directory directly to Codecov, delegating merging to Codecov and simplifying the workflow.

sequenceDiagram
    participant GH_Actions as GitHub Actions Runner
    participant Artifacts as Coverage Artifacts (workspace/coverage)
    participant Codecov as Codecov Action

    GH_Actions->>Artifacts: Download coverage-artifacts-* into coverage/
    Note right of GH_Actions: Previously: reorganize & npx nyc merge -> merged-output/coverage-summary.json
    GH_Actions->>Codecov: Upload coverage directory (coverage) via codecov-action
    Codecov-->>GH_Actions: Process & merge coverage reports (server-side)

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