withCredentials() works with GitLabApiToken, but credentials() doesn't

[neyrick]

Jenkins and plugins versions report

Follow-up to #536 and #1754

The withCredentials() syntax does work indeed in pipelines thanks to this MR, but the credentials() one doesn't.

Environment

What Operating System are you using (both controller, and any agents involved in the problem)?

Rocky Linux 9

Reproduction steps

Sample pipeline:

pipeline {
    agent any

  environment {
    GITLAB_API_TOKEN = credentials('tokentest')
  }
    
    stages {
        stage('Hello') {
            steps {
                    echo 'Hello World'
            }
        }
    }
}

Expected Results

Token injected as GITLAB_API_TOKEN

Actual Results

Error message:

ERROR: No suitable binding handler could be found for type com.dabsquared.gitlabjenkins.connection.GitLabApiTokenImpl. Supported types are StandardUsernamePasswordCredentials,FileCredentials,DockerServerCredentials,StringCredentials,SSHUserPrivateKey.

Anything else?

No response

Are you interested in contributing a fix?

No response