[CI] cherry-pick elastic#20891 (elastic#21314)

Co-authored-by: Ivan Fernandez Calvo <kuisathaverat@users.noreply.github.com>

Jenkinsfile

@@ -23,6 +23,7 @@ pipeline {
     JOB_GCS_CREDENTIALS = 'beats-ci-gcs-plugin'
     OSS_MODULE_PATTERN = '^[a-z0-9]+beat\\/module\\/([^\\/]+)\\/.*'
     PIPELINE_LOG_LEVEL = 'INFO'
+    PYTEST_ADDOPTS = "${params.PYTEST_ADDOPTS}"
     RUNBLD_DISABLE_NOTIFICATIONS = 'true'
     SLACK_CHANNEL = "#beats-ci-builds"
     TERRAFORM_VERSION = "0.12.24"
@@ -47,6 +48,7 @@ pipeline {
     string(name: 'awsRegion', defaultValue: 'eu-central-1', description: 'Default AWS region to use for testing.')
     booleanParam(name: 'runAllStages', defaultValue: false, description: 'Allow to run all stages.')
     booleanParam(name: 'macosTest', defaultValue: false, description: 'Allow macOS stages.')
+    string(name: 'PYTEST_ADDOPTS', defaultValue: '', description: 'Additional options to pass to pytest. Use PYTEST_ADDOPTS="-k pattern" to only run tests matching the specified pattern. For retries you can use `--reruns 3 --reruns-delay 15`')
   }
   stages {
     stage('Checkout') {