[8.x] Remove redundant overlays (#3905)

[lcawl]

Backport

This will backport the following commits from main to 8.x:

• Remove redundant overlays (#3905)

Questions ?

Please refer to the Backport tool documentation

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
ilm.migrate_to_data_tiers	⚪	Missing test	Missing test
indices.downsample	🟢	3/3	3/3
searchable_snapshots.cache_stats	⚪	Missing test	Missing test
security.activate_user_profile	🟢	9/9	9/9
security.enroll_kibana	⚪	Missing test	Missing test
security.enroll_node	⚪	Missing test	Missing test
security.get_user_profile	🟢	8/8	8/8
security.has_privileges_user_profile	🟢	3/3	3/3
security.oidc_authenticate	⚪	Missing test	Missing test
security.oidc_logout	⚪	Missing test	Missing test
security.oidc_prepare_authentication	⚪	Missing test	Missing test
security.saml_authenticate	⚪	Missing test	Missing test
security.saml_complete_logout	⚪	Missing test	Missing test
security.saml_invalidate	⚪	Missing test	Missing test
security.saml_logout	⚪	Missing test	Missing test
security.saml_prepare_authentication	⚪	Missing test	Missing test
security.saml_service_provider_metadata	⚪	Missing test	Missing test
security.suggest_user_profiles	🟢	1/1	1/1
security.update_api_key	🟢	5/5	5/5
security.update_user_profile_data	🟢	1/1	1/1

You can validate these APIs yourself by using the make validate target.