[Logs UI] Create API route to check the status of ML jobs

[Zacqary]

Part of #41509

Acceptance criteria

POST /api/infra/log_analysis/jobs/status

• This returns a confimation of the presence and integrity of the three ML jobs.
• Each job ID follows the format of kibana.infra-ui.${spaceId}.${sourceId}.${jobType}. This allows us to know the expected job ID even if a job's status is missing

interface GetJobStatusRequest {
  data: {
    sourceId: string;
  };
}

interface GetJobStatusSuccessResponse {
  data: {
    jobs: Array<{
      jobId: string;
      jobType: JobType;
      jobStatus: JobStatus;
    }>;
  };
}

type JobType = 'log_entry_rate' | 'rare_log_categories' | 'high_log_categories'
type JobStatus = 'created' | 'missing' | 'running'

interface GetJobStatusFailureResponse {
  errors: Array<HTTPError>
}

interface HTTPError {
  statusCode: number;
  error: string;
  message: string;
  attributes?: Object;
}

[elasticmachine]

Pinging @elastic/infra-logs-ui

[weltenwort]

The existing ml module route /api/ml/jobs/jobs_summary can be used to query multiple job status. There is no need for a custom API.