Evaluate `terminate` processor

[mashhurs]

Description

terminate processor appeared in servicenow package which is not in supported list or either we don't know the behaviour.
Analyze and document the terminate processor: https://github.com/elastic/integrations/blob/main/packages/servicenow/data_stream/event/elasticsearch/ingest_pipeline/default.yml#L4

ADD: E2E pipeline actually caught this as a failure: https://buildkite.com/elastic/logstash-filter-elastic-integration-e2e/builds/224#01980a4a-36a3-40c9-9bb0-0a3e381721d9
It seems, terminate processor isn't in the registered processors list: https://github.com/elastic/logstash-filter-elastic_integration/blob/main/src/main/java/co/elastic/logstash/filters/elasticintegration/EventProcessorBuilder.java#L94

[mashhurs]

Highlighted versions include terminate processor support.