fix: Handle disabled shelter signals

[suejung-sentry]

In self-hosted / enterprise, our customers may not always have shelter deployed. Add a check for those signals that call shelter to confirm first that shelter is enabled.

This PR is paired with a similar fix done in api here to fix regenerateOrgUploadToken when shelter disabled.

Closes codecov/engineering-team#3212

[codecov-notifications]

Codecov Report

Attention: Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
database/events.py	77.77%	2 Missing ⚠️

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[codecov]

Codecov Report

Attention: Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.78%. Comparing base (ac302e7) to head (3fdebda).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
database/events.py	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1005      +/-   ##
==========================================
- Coverage   97.79%   97.78%   -0.01%     
==========================================
  Files         447      447              
  Lines       36175    36192      +17     
==========================================
+ Hits        35376    35391      +15     
- Misses        799      801       +2     

Flag	Coverage Δ
integration	42.14% <35.29%> (-0.01%)	⬇️
unit	90.47% <88.23%> (-0.01%)	⬇️

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[github-actions]

✅ All tests successful. No failed tests were found.

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[codecov-qa]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
1772	1	1771	4

View the top 1 failed tests by shortest run time

database/tests/unit/test_events.py::test_shelter_repo_sync

Stack Traces | 0.048s run time

dbsession = <sqlalchemy.orm.session.Session object at 0x7fa5db116300>
mock_configuration = <shared.config.ConfigHelper object at 0x7fa5db115b80>
mocker = <pytest_mock.plugin.MockFixture object at 0x7fa5e03a1c10>

    def test_shelter_repo_sync(dbsession, mock_configuration, mocker):
        # this prevents the pubsub SDK from trying to load credentials
        os.environ["PUBSUB_EMULATOR_HOST"] = "localhost"
    
        mock_configuration.set_params(
            {
                "setup": {
                    "shelter": {
                        "pubsub_project_id": "test-project-id",
                        "sync_repo_topic_id": "test-topic-id",
                    }
                }
            }
        )
    
        publish = mocker.patch("google.cloud.pubsub_v1.PublisherClient.publish")
    
        # this triggers the publish via SQLAlchemy events (after_insert)
        repo = RepositoryFactory(repoid=91728376, name="test-123")
        dbsession.add(repo)
        dbsession.commit()
    
>       publish.assert_called_once_with(
            ".../test-project-id/topics/test-topic-id",
            b'{"type": "repo", "sync": "one", "id": 91728376}',
        )
E       AssertionError: Expected 'publish' to be called once. Called 0 times.

.../tests/unit/test_events.py:29: AssertionError

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[codecov-public-qa]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
1772	1	1771	4

View the top 1 failed tests by shortest run time

database/tests/unit/test_events.py::::test_shelter_repo_sync

Stack Traces | 0.048s run time

dbsession = <sqlalchemy.orm.session.Session object at 0x7fa5db116300>
mock_configuration = <shared.config.ConfigHelper object at 0x7fa5db115b80>
mocker = <pytest_mock.plugin.MockFixture object at 0x7fa5e03a1c10>

    def test_shelter_repo_sync(dbsession, mock_configuration, mocker):
        # this prevents the pubsub SDK from trying to load credentials
        os.environ["PUBSUB_EMULATOR_HOST"] = "localhost"
    
        mock_configuration.set_params(
            {
                "setup": {
                    "shelter": {
                        "pubsub_project_id": "test-project-id",
                        "sync_repo_topic_id": "test-topic-id",
                    }
                }
            }
        )
    
        publish = mocker.patch("google.cloud.pubsub_v1.PublisherClient.publish")
    
        # this triggers the publish via SQLAlchemy events (after_insert)
        repo = RepositoryFactory(repoid=91728376, name="test-123")
        dbsession.add(repo)
        dbsession.commit()
    
>       publish.assert_called_once_with(
            ".../test-project-id/topics/test-topic-id",
            b'{"type": "repo", "sync": "one", "id": 91728376}',
        )
E       AssertionError: Expected 'publish' to be called once. Called 0 times.

.../tests/unit/test_events.py:29: AssertionError

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