Code Coverage is broken

[shizhMSFT]

The code coverage report is not working for both push and pull request. The error message looks like

[2024-08-14T07:59:29.329Z] ['info'] Pinging Codecov: https://codecov.io/upload/v4?package=github-action-3.1.6-uploader-0.8.0&token=*******&branch=detached-payloads&build=10379234171&build_url=https%3A%2F%2Fgithub.com%2Fveraison%2Fgo-cose%2Factions%2Fruns%2F10379234171&commit=40060e004d6e055dbfb469ec1e25dff5f9be94c1&job=ci&pr=197&service=github-actions&slug=veraison%2Fgo-cose&name=&tag=&flags=&parent=
[2024-08-14T07:59:[29](https://github.com/veraison/go-cose/actions/runs/10379234171/job/28749131986?pr=197#step:5:30).496Z] ['error'] There was an error running the uploader: Error uploading to https://codecov.io: Error: There was an error fetching the storage URL during POST: 429 - {'detail': ErrorDetail(string='Rate limit reached. Please upload with the Codecov repository upload token to resolve issue. Expected time to availability: 216s.', code='throttled')}
[2024-08-14T07:59:29.497Z] ['info'] Codecov will exit with status code 0. If you are expecting a non-zero exit code, please pass in the `-Z` flag

The broken code coverage is required to be fixed as soon as possible. Otherwise, PRs might be merged without sufficient code coverage, rending the quality drop of this repository.

The reason is that we did not provide a CODECOV_TOKEN when uploading the code coverage report.