[8.0] Finalize removal of legacy audit logger (#116282)

[kibanamachine]

Backports the following commits to 8.0:

• Finalize removal of legacy audit logger (Finalize removal of legacy audit logger #116282)

[kibanamachine]

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• Commit: c65acb1
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Metrics [docs]

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
security	54	47	-7

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
security	51.1KB	51.0KB	-107.0B

Unknown metric groups

API count

id	before	after	diff
security	116	108	-8

References to deprecated APIs

id	before	after	diff
actions	15	12	-3
alerting	20	15	-5
encryptedSavedObjects	4	2	-2
security	71	69	-2
total			-12

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @watson