[SDK] Chore: Sets coverage thresholds (#5530)

CNCT-2485

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## PR-Codex overview
This PR focuses on updating the code coverage settings and the GitHub Actions workflow for better integration with Codecov.

### Detailed summary
- Updated `codecov.yml` to set `target` coverage to `80%` instead of `auto`.
- Modified `.github/workflows/CI.yml`:
  - Changed the step name from `Upload coverage reports to Codecov` to `Code Coverage`.
  - Specified the `directory` for coverage reports as `packages/`.

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.github/workflows/CI.yml

@@ -87,7 +87,7 @@ jobs:
 
       - run: pnpm test
 
-      - name: Upload coverage reports to Codecov
+      - name: Code Coverage
         uses: codecov/codecov-action@v5
         with:
           directory: packages/

codecov.yml

@@ -5,7 +5,7 @@ coverage:
         target: auto
     patch:
       packages:
-        target: auto
+        target: 80%
         flags:
           - packages