Fixes 4952: add snaps list with temp list/fetch

[jlsherrill]

Summary

Adds snapshot list to template list and fetch api calls.

Testing steps

1. Create a repository, let it snapshot
2. Create a template with that repository:

####
POST http://localhost:8000/api/content-sources/v1.0/templates/
x-rh-identity: eyJpZGVudGl0eSI6eyJvcmdfaWQiOiI5IiwgInR5cGUiOiJVc2VyIiwidXNlciI6eyJ1c2VybmFtZSI6ImZvbyJ9LCJhY2NvdW50X251bWJlciI6ImZvbyIsImludGVybmFsIjp7Im9yZ19pZCI6IjkifX19Cg==
Content-Type: application/json

{
  "name":"test3",
  "arch": "x86_64",
  "version": "9",
  "repository_uuids": ["48b89a40-7d3d-4bd8-8596-f20d77c42032"],
  "date": "2024-09-10T15:09:43-04:00"
}

3. Fetch/list the template and see the snapshot list:

{
  "data": [
    {
      "uuid": "01bc2b42-b74c-47f4-a9bd-1da2e8b3e941",
      "name": "test3",
      "org_id": "9",
      "description": "",
      "arch": "x86_64",
      "version": "9",
      "date": "2024-09-10T19:09:43Z",
      "repository_uuids": [
        "48b89a40-7d3d-4bd8-8596-f20d77c42032"
      ],
      "snapshots": [
        {
          "uuid": "4c8a35e0-56d4-46bb-b875-2463a954c6cc",
          "created_at": "2024-11-04T13:50:19.182357Z",
          "repository_path": "48e64014/48b89a40-7d3d-4bd8-8596-f20d77c42032/78f2a819-46c8-4188-8403-dfe3f145180d",
          "content_counts": {
            "rpm.advisory": 1235,
            "rpm.package": 7326,
            "rpm.packagecategory": 4,
            "rpm.packageenvironment": 3,
            "rpm.packagegroup": 34,
            "rpm.repo_metadata_file": 1
          },
          "added_counts": {
            "rpm.advisory": 1235,
            "rpm.package": 7326,
            "rpm.packagecategory": 4,
            "rpm.packageenvironment": 3,
            "rpm.packagegroup": 34,
            "rpm.repo_metadata_file": 1
          },
          "removed_counts": {},
          "url": "",
          "repository_name": "",
          "repository_uuid": ""
        }
      ],
      "rhsm_environment_id": "01bc2b42b74c47f4a9bd1da2e8b3e941",
      "created_by": "foo",
      "last_updated_by": "foo",
      "created_at": "2024-11-05T20:10:36.695726Z",
      "updated_at": "2024-11-05T20:10:36.695726Z",
      "use_latest": false,
      "last_update_snapshot_error": "",
      "last_update_task_uuid": "9fe2020f-6499-40b1-9723-43385fccbf22",
      "last_update_task": {
        "uuid": "9fe2020f-6499-40b1-9723-43385fccbf22",
        "status": "failed",
        "created_at": "2024-11-05T20:13:37Z",
        "ended_at": "2024-11-05T20:13:37Z",
        "error": "",
        "org_id": "9",
        "type": "update-template-content",
        "object_type": "template",
        "object_name": "test3",
        "object_uuid": "01bc2b42-b74c-47f4-a9bd-1da2e8b3e941"
      },
      "rhsm_environment_created": true
    }
  ],
  "meta": {
    "limit": 100,
    "offset": 0,
    "count": 1
  },
  "links": {
    "first": "/api/content-sources/v1.0/templates/?limit=100&offset=0",
    "last": "/api/content-sources/v1.0/templates/?limit=100&offset=0"
  }
}

One thing to note is that the snapshot list isn't populated at creation time, but instead via the update_content_template task. I'm not sure we can do much at this time about it.

[jlsherrill]

note this includes some changes from #865 so that will have to go in first and this be rebased.

[jlsherrill]

https://issues.redhat.com/browse/HMS-4952