Add checks to rename processor for the message field for all Observability Integrations

[ishleenk17]

This ticket is created as a followup of #3451
The rename processor (renaming message to event.original) in the ingest pipelines for log datastreams don't have an if/ignore_missing check

Current state:

• rename:
  field: message
  target_field: event.original

Expected State:

• rename:
  field: message
  target_field: event.original
  ignore_missing: true
  if: 'ctx.event?.original == null'
  description: 'Renames the original message field to event.original to store a copy of the original message. The event.original field is not touched if the document already has one; it may happen when Logstash sends the document.'

Below are the Observability Integrations which need this change

Phase1 updates:

• apache Add null checks and ignore_missing checks to the rename processor #7845
• apache_tomcat Add null checks and ignore_missing checks to the rename processor #7845
• cassandra Add null checks and ignore_missing checks to the rename processor #7845
• ceph Add null checks and ignore_missing checks to the rename processor #7845
• citrix_adc Add null checks and ignore_missing checks to the rename processor #7845
• golang Add null checks and ignore_missing checks to the rename processor #7845
• hadoop Add null checks and ignore_missing checks to the rename processor #7845
• haproxy Add null checks and ignore_missing checks to the rename processor #7845
• iis Add null checks and ignore_missing checks to the rename processor #7845
• kafka Add null checks and ignore_missing checks to the rename processor #7845
• microsoft_sqlserver Add null checks and ignore_missing checks to the rename processor #7845
• nginx Add null checks and ignore_missing checks to the rename processor #7845
• oracle Add null checks and ignore_missing checks to the rename processor #7845
• oracle_weblogic Add null checks and ignore_missing checks to the rename processor #7845
• php_fpm Add null checks and ignore_missing checks to the rename processor #7845
• postgresql Add null checks and ignore_missing checks to the rename processor #7845
• rabbitmq Add null checks and ignore_missing checks to the rename processor #7845
• redis Add null checks and ignore_missing checks to the rename processor #7845
• traefik Add null checks and ignore_missing checks to the rename processor #7845
• nagios_xi Add null checks and ignore_missing checks to the rename processor #7845

Cloud Monitoring:

• aws [AWS] Add the ignore_missing and null checks to rename processor #7933
• azure_frontdoor [Azure] Update null checks and if checks in the rename processor #7953
• gcp [GCP] Update null checks and if checks in the rename #7934

Cloud Native:

• istio [Cloudnative] Update null checks and if checks in the rename processor #7956
• nats [Cloudnative] Update null checks and if checks in the rename processor #7956
• nginx_ingress_controller [Cloudnative] Update null checks and if checks in the rename processor #7956
• stan [Cloudnative] Update null checks and if checks in the rename processor #7956

Phase2 updates:

• activemq Add null and ignore_missing check to handle event.original field. #8624
• coredns Add null and ignore_missing check to handle event.original field. #8624
• ibmmq Add null and ignore_missing check to handle event.original field. #8624
• mongodb Add null and ignore_missing check to handle event.original field. #8624
• mysql [Mysql] Add support for tags, processors & preserve_original_event #8626
• salesforce Add null and ignore_missing check to handle event.original field. #8624
• spring_boot Add null and ignore_missing check to handle event.original field. #8624
  - [ ] tomcat Will soon be deprecated.
• vsphere Add null and ignore_missing check to handle event.original field. #8624

[lalit-satapathy]

Adding @ritalwar for phase 2.

[ritalwar]

Implemented null checks for all the mentioned packages of Phase2 in this PR.

Due to the upcoming deprecation of Tomcat Netwitness logs, with a recommendation to switch to Apache Tomcat, we won't include these checks there.

As of now, there is no existing rename or set processor to manage event.original in the MySQL package. This will be taken care in a separate issue. Therefore, I'm closing this one.