[8.6] Add open API specification for list connector types (#145951)

[kibanamachine]

Backport

This will backport the following commits from main to 8.6:

• Add open API specification for list connector types (#145951)

Questions ?

Please refer to the Backport tool documentation

[github-actions]

Documentation preview:

• ✨ Changed pages

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 053d5dc

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	442	448	+6
total			+19

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	20	22	+2
fleet	68	74	+6
osquery	109	115	+6
securitySolution	519	525	+6
total			+20

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

cc @lcawl