x-pack-otel plugin follow-up tasks

[gregkalapos]

#111091 introduced the otel-data plugin. That PR moved a few things to core to enable sharing across apm-data and otel-data and defined the initial mappings for otel-data.

otel-data is currently by default disabled because it's in an early stage.

This issue is to track follow-up adjustment which we'd like to make.

• Move ignore_malformed to metrics@settings x-pack/plugin/otel: introduce x-pack-otel plugin #111091 (comment)
• Add tests that tests that verify the consistency of the different index template x-pack/plugin/otel: introduce x-pack-otel plugin #111091 (comment)
• Enabling LogsDB x-pack/plugin/otel: introduce x-pack-otel plugin #111091 (comment) - Initial commit done in x-pack-otel plugin follow-up tasks  #111877, but we may add more index.sort.field fields. See: x-pack/plugin/otel: introduce x-pack-otel plugin #111091 (comment)
• Cover metrics mappings with tests: [otel-data] Hide 10m and 60m aggregated metrics generated for the APM UI #114042 (comment)
• Add index.mapping.ignore_malformed: true to a the central place used by all signals: OTel mappings: avoid metrics to be rejected when attributes are malformed #114856 (comment)

[elasticsearchmachine]

Pinging @elastic/es-data-management (Team:Data Management)