chore: use codecov token instead of OIDC (#32129)

For PR from forks, OIDC doesn't currently work with the latest version of the GitHub Action. 

[Example failure](https://github.com/aws/aws-cdk/actions/runs/11834319601/job/32974759899?pr=32121):

```console
Run codecov/codecov-action@v4
Error: Codecov: Failed to get OIDC token with url: https://codecov.io/. Error message: Unable to get ACTIONS_ID_TOKEN_REQUEST_URL env variable
```

See codecov/codecov-action#1594

Revert back to token until we validate a fix. 

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

.github/workflows/codecov.yml

@@ -11,8 +11,6 @@ jobs:
     name: collect
     if: github.repository == 'aws/aws-cdk'
     runs-on: ubuntu-latest
-    permissions:
-      id-token: write    
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -35,4 +33,4 @@ jobs:
           directory: packages/aws-cdk/coverage
           fail_ci_if_error: true
           flags: suite.unit
-          use_oidc: true
+          token: ${{ secrets.CODECOV_TOKEN }}