Include fail_on_error for decode_json_fields processor configuration settings

[greicefaustino]

Describe the enhancement: Have the fail_on_error
(fail_on_error - If false failures are ignored and the processor continues to the next field. Default is true.) that already exists in other processors also for decode_json_fields.

Describe a specific use case for the enhancement or feature:

When using "decode_json_fields", and it fails when it ingests non-json data, which is fine, the rest of the pipeline won't run if this step fails and there is no way to workaround this to keep using Filebeat processors.

The only way out is to migrate to ingest pipelines.

[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)