[ResponseOps] Prepare the connector execute HTTP API for versioning

[doakalexi]

Towards https://github.com/elastic/response-ops-team/issues/125

Summary

Preparing the POST ${BASE_ACTION_API_PATH}/connector/{id}/_execute HTTP API for versioning

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💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 39e8efd

Failed CI Steps

• Jest Integration Tests #6

Test Failures

• [job] [logs] Jest Integration Tests #6 / migration actions reindex & waitForReindexTask resolves left wait_for_task_completion_timeout when the task does not finish within the timeout

Metrics [docs]

✅ unchanged

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@elasticmachine merge upstream