fix(flaky-trace-view-acceptance-test): Adding teardown disconnecting django.db connections

[Abdkhan14]

From the logs in these CI failures: https://github.com/getsentry/sentry/actions/runs/19441373608/job/55625251336 The db connections from the tests are leaking to the next tests in the queue

Added a teardown that closes all connections. Couldn't reproduce a failure though

[codecov[bot]]

:x: 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
29772	1	29771	242

View the top 1 failed test(s) by shortest run time

tests.sentry.api.test_api_owners.APIOwnersTestCase::test_api_owner_is_a_valid_code_owner

Stack Traces | 0.048s run time

#x1B[1m#x1B[.../sentry/api/test_api_owners.py#x1B[0m:22: in test_api_owner_is_a_valid_code_owner
    assert owner.value in self.teams
#x1B[1m#x1B[31mE   AssertionError: assert 'visibility' in {'alerts-create-issues', 'alerts-notifications', 'codecov', 'crons', 'dashboards', 'data', ...}#x1B[0m
#x1B[1m#x1B[31mE    +  where 'visibility' = <ApiOwner.VISIBILITY: 'visibility'>.value#x1B[0m
#x1B[1m#x1B[31mE    +  and   {'alerts-create-issues', 'alerts-notifications', 'codecov', 'crons', 'dashboards', 'data', ...} = <tests.sentry.api.test_api_owners.APIOwnersTestCase testMethod=test_api_owner_is_a_valid_code_owner>.teams#x1B[0m

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