How to mark build success when one of the stages is aborted?
I answered that question stackoveflow and I'll post the answer here:

For a Declarative pipeline (not a scripted) you would do something like this

stage('Foo') {
      steps {
            script {
                env.PROCEED_TO_DEPLOY = 1
                try {
                    timeout(time: 2, unit: 'MINUTES') {
                        // ...
                    }
                } catch (err) {
                    env.PROCEED_TO_DEPLOY = 0
                }
            }
      }
  }
  stage('Bar') {
    when {
        expression {
            env.PROCEED_TO_DEPLOY == 1
        }
    }
    //rest of your pipeline


stage "Bar" would be skipped but as for the rest of the stages the job will be marked as passed (assuming nothing wrong happened before).

As for your particular use-case, the trick is to use a try/catch block.