Add the ability to pass the credentialsId in the publishChecks step

### Feature Request

Add the credentialsId argument to the `publishChecks` step (https://github.com/jenkinsci/checks-api-plugin#pipeline-usage). Then, it will be possible to use this feature explicitly in Jenkins jobs without changing the Job definition.

### Why

IIUC, the only way to use this particular step is only when the GitHub App has been enabled in the Job level since GitHub checks are enabled on a GH App but no service accounts.

### Further details

https://plugins.jenkins.io/pipeline-githubnotify-step/ enables to set a credentialsId instead using the one in the Job definition.