[8.6] [DOCS] Create open API specification for find rules (#147061)

[kibanamachine]

Backport

This will backport the following commits from main to 8.6:

• [DOCS] Create open API specification for find rules (#147061)

Questions ?

Please refer to the Backport tool documentation

[github-actions]

Documentation preview:

• ✨ Changed pages

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 0092ad5

Failed CI Steps

• FTR Configs #28

Test Failures

• [job] [logs] FTR Configs #28 / dashboard elements dashboard elements Controls Dashboard options list integration Interactions between options list and dashboard test data view runtime field making selection has expected results

Metrics [docs]

Unknown metric groups

ESLint disabled in files

id	before	after	diff
osquery	1	2	+1

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	19	21	+2
fleet	59	65	+6
osquery	108	113	+5
securitySolution	441	447	+6
total			+19

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	20	22	+2
fleet	68	74	+6
osquery	109	115	+6
securitySolution	518	524	+6
total			+20

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

cc @lcawl