Allowed 'start_sync_job' to use an 'api' source

[CraigBryan]

The sync API doesn't need an integration id when using an 'api' source.

[CraigBryan]

Example error

In [1]: from jupiterone import JupiterOneClient

In [2]: j1 = JupiterOneClient(account="<accountid>", token="<token>", url="https://graphql.us.jupiterone.io", sync_url="https://api.us.jupiterone.io")

In [3]: j1.start_sync_job(sync_mode="PATCH", source="api")
---------------------------------------------------------------------------
JupiterOneApiError                        Traceback (most recent call last)
Cell In[3], line 1
----> 1 j1.start_sync_job(sync_mode="PATCH", source="api")

File ~/.pyenv/versions/3.12.4/envs/j1_gh_push_pull/lib/python3.12/site-packages/jupiterone/client.py:549, in JupiterOneClient.start_sync_job(self, instance_id, sync_mode, source)
    541 endpoint = "/persister/synchronization/jobs"
    543 data = {
    544        "source": source,
    545        "integrationInstanceId": instance_id,
    546        "syncMode": sync_mode
    547        }
--> 549 response = self._execute_syncapi_request(endpoint=endpoint, payload=data)
    551 return response

File ~/.pyenv/versions/3.12.4/envs/j1_gh_push_pull/lib/python3.12/site-packages/jupiterone/client.py:313, in JupiterOneClient._execute_syncapi_request(self, endpoint, payload)
    311     data = json.loads(content)
    312     content = data.get("error", data.get("errors", content))
--> 313 raise JupiterOneApiError("{}:{}".format(response.status_code, content))

JupiterOneApiError: 400:{'message': 'Expected { source: "api"; scope?: string; syncMode?: "DIFF" | "CREATE_OR_UPDATE" | "PATCH"; deletionMode?: "SOFT_DELETE" | "HARD_DELETE"; } | { source: "integration-managed" | "integration-external"; integrationInstanceId: string; integrationJobId?: string; syncMode?: "DIFF" | "CREATE_OR_UPDATE" | "PATCH"; deletionMode?: "SOFT_DELETE" | "HARD_DELETE"; }, but was object', 'code': 'MALFORMED_PAYLOAD', 'errorType': 'USER_ERROR', 'statusCode': 400, 'correlationId': '468f13c1-f403-4a27-9623-cd68c65cdb90'}