Make ingestion more resilient by ignoring malformed and avoid field explosion

We want to reduce the risk of mapping conflicts. The APM solution should adopt ES features to make ingestion more resilient:

(1) Add `ignore_malformed: true` to the root of the mappings. See also https://github.com/elastic/elasticsearch/pull/95329. Ignores fields with type conflicts instead of rejecting the whole document.
Validation Criteria: Ingesting a label foo: 42, then foo: "bar" doesn't lead to data loss

(2) Add `dynamic: until_limit` to avoid that field explosions lead to data loss. Relates to https://github.com/elastic/elasticsearch/pull/96235.
Validation Criteria: Exceeding the field limit by creating many unique labels doesn't lead to data loss