[DOCS] Create open API specification for run connector

[lcawl]

Summary

Relates to #137240

This PR creates an open API specification for the run connector API.

NOTE:

• The specification currently covers only index, Jira, Opsgenie and server log, ServiceNow, and Swimlane connectors.

When I try to group the possible actions by connector, I receive warnings during linting, seemingly because the same action type (e.g. pushToService or getChoices) can be used for multiple connector types with differing subActionParams and there is no associated connector type parameter to distinguish which are valid together.
The linting warnings looked like this:

[9] bundled.json:4305:21 at #/components/examples/run_servicenow_itom_connector_request/value/params

Example value must conform to the schema: `params` property must match exactly one schema in oneOf.

4303 |   "summary": "Run a ServiceNow ITOM connector to retrieve the list of choices.",
4304 |   "value": {
4305 |     "params": {
4306 |       "subAction": "getChoices",
   … |       < 6 more lines >
4313 |     }
4314 |   }
4315 | },

Therefore, I have grouped the options by subAction type instead.

[elasticmachine]

Pinging @elastic/response-ops (Team:ResponseOps)

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: b34b998

Failed CI Steps

• FTR Configs #34

Test Failures

• [job] [logs] FTR Configs #34 / cases security and spaces enabled: trial push_case incident recorder server should map the fields and add the backlink to Kibana correctly

Metrics [docs]

✅ unchanged

History

• 💚 Build #102728 succeeded 63bbeec
• 💚 Build #102429 succeeded ae0d8bf
• 💚 Build #102265 succeeded 304f780
• 💛 Build #102023 was flaky 45eddb5
• 💚 Build #101597 succeeded eae45cd

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

[szabosteve]

LGTM!

[kibanamachine]

💚 All backports created successfully

Status	Branch	Result
✅	8.6

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