[CI][NITPICK] .yml to yaml github workflows (#9664)

# Introduction
Applying the most present `yaml` file extension to all
`.github/workflows/` files

## Notes
Regarding the `restore-cache` and `save-cache` composite actions github
agnostically searches for any `DockerFile` `action.yml` and
`action.yaml` within the target folder when invoking composite actions
as follows:
```yml
      - name: Restore storybook build cache
        if: steps.changed-files.outputs.any_changed == 'true'
        uses: ./.github/workflows/actions/restore-cache
        with: 
          key: ${{ env.STORYBOOK_BUILD_CACHE_KEY }}
```

.github/workflows/ci-e2e.yaml

@@ -62,7 +62,7 @@ jobs:
         files: |
           packages/**
           playwright.config.ts
-          .github/workflows/ci-e2e.yml
+          .github/workflows/ci-e2e.yaml
 
     - name: Skip if no relevant changes
       if: steps.changed-files.outputs.any_changed == 'false'