feat: Turn the unraisable exception integration on by default

[alexander-alderman-webb]

See #4733 (comment)

[codecov]

❌ 1335 Tests Failed:

Tests completed	Failed	Passed	Skipped
3286	1335	1951	954

View the top 3 failed test(s) by shortest run time

::tests.test_basics

Stack Traces | 0s run time

ImportError while importing test module '.../sentry-python/tests/test_basics.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
.tox/py3.13-common-v1.36.0/lib/python3.13.../site-packages/_pytest/python.py:498: in importtestmodule
    mod = import_path(
.tox/py3.13-common-v1.36.0/lib/python3.13.../site-packages/_pytest/pathlib.py:587: in import_path
    importlib.import_module(module_name)
.../hostedtoolcache/Python/3.13.7....../x64/lib/python3.13/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
<frozen importlib._bootstrap>:1387: in _gcd_import
    ???
<frozen importlib._bootstrap>:1360: in _find_and_load
    ???
<frozen importlib._bootstrap>:1331: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:935: in _load_unlocked
    ???
.tox/py3.13-common-v1.36.0/lib/python3.13.../_pytest/assertion/rewrite.py:186: in exec_module
    exec(co, module.__dict__)
tests/test_basics.py:496: in <module>
    importlib.import_module(integration.rsplit(".", 1)[0]),
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.../hostedtoolcache/Python/3.13.7....../x64/lib/python3.13/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
<frozen importlib._bootstrap>:1387: in _gcd_import
    ???
<frozen importlib._bootstrap>:1360: in _find_and_load
    ???
<frozen importlib._bootstrap>:1324: in _find_and_load_unlocked
    ???
E   ModuleNotFoundError: No module named 'sentry_sdk.integrations.unraisablehook'

tests.integrations.httpx.test_httpx::test_crumb_capture_client_error[405-warning-httpx_client0]

Stack Traces | 0s run time

.tox/py3.9-httpx-latest/lib/python3.9.../site-packages/pytest_httpx/__init__.py:67: in httpx_mock
    mock._assert_options()
.tox/py3.9-httpx-latest/lib/python3.9.../site-packages/pytest_httpx/_httpx_mock.py:319: in _assert_options
    assert not callbacks_not_executed, (
E   AssertionError: The following responses are mocked but not requested:
E     - Match any request
E     
E     If this is on purpose, refer to https://github..../blob/master/README.md#allow-to-register-more-responses-than-what-will-be-requested
E   assert not [<pytest_httpx._request_matcher._RequestMatcher object at 0x7f9f1d3d5130>]

tests.integrations.httpx.test_httpx::test_propagates_twp_outside_root_span

Stack Traces | 0s run time

.tox/py3.9-httpx-latest/lib/python3.9.../site-packages/pytest_httpx/__init__.py:67: in httpx_mock
    mock._assert_options()
.tox/py3.9-httpx-latest/lib/python3.9.../site-packages/pytest_httpx/_httpx_mock.py:319: in _assert_options
    assert not callbacks_not_executed, (
E   AssertionError: The following responses are mocked but not requested:
E     - Match any request
E     
E     If this is on purpose, refer to https://github..../blob/master/README.md#allow-to-register-more-responses-than-what-will-be-requested
E   assert not [<pytest_httpx._request_matcher._RequestMatcher object at 0x7f9f1d7f35e0>]

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[seer-by-sentry]

Potential bug: Adding a non-existent integration causes an unhandled `ModuleNotFoundError` in `iter_default_integrations`, crashing applications during `sentry_sdk.init()`.

• Description: The iter_default_integrations function attempts to import sentry_sdk.integrations.unraisablehook.UnraisablehookIntegration, which does not exist in the codebase. This action triggers a ModuleNotFoundError. The try...except block within the function is not configured to catch this specific exception, as it only handles DidNotEnable and SyntaxError. As a result, the unhandled ModuleNotFoundError will propagate up the call stack during SDK initialization (sentry_sdk.init()), causing any application using the SDK with default settings to crash on startup.

• Suggested fix: Add ModuleNotFoundError to the except clause in the iter_default_integrations function. This will ensure that attempting to load a non-existent integration is gracefully handled by logging a debug message and continuing, which matches the intended behavior for other integration loading failures.
  _{severity: 0.9, confidence: 0.98}

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