Fix flake8

[sentrivana]

Tiny PR with some flake8 fixes:

• some extra imports

• testing a removed util

• ignoring sentry_sdk/integrations/aiohttp.py:393:33: E231 missing whitespace after ':' on this line

  url = f"{request.scheme}://{request.host}{request.path}"

  🙄

Original output:

linters: commands[0]> flake8 tests sentry_sdk
tests/test_utils.py:109:12: F821 undefined name 'datetime_from_isoformat'
tests/test_api.py:4:1: F401 'sentry_sdk' imported but unused
sentry_sdk/_init_implementation.py:1:1: F401 'warnings' imported but unused
sentry_sdk/integrations/aiohttp.py:393:33: E231 missing whitespace after ':'

[codecov]

❌ 1600 Tests Failed:

Tests completed	Failed	Passed	Skipped
19820	1600	18220	4413

View the top 1 failed tests by shortest run time

tests.test_scope test_with_isolation_scope

Stack Traces | 0.001s run time

tests/test_scope.py:357: in test_with_isolation_scope
    assert scope is in_with_isolation_scope
E   assert <PotelScope id=0x7f1444fd37a0 name=None type=ScopeType.ISOLATION> is <Scope id=0x7f14482ceb20 name=None type=ScopeType.ISOLATION>

View the full list of 2 ❄️ flaky tests

tests.test_scope test_with_isolation_scope_data

Flake rate in main: 99.16% (Passed 2 times, Failed 235 times)

Stack Traces | 0.001s run time

tests/test_scope.py:387: in test_with_isolation_scope_data
    assert scope._tags == {"before_isolation_scope": 1}
E   AssertionError: assert {} == {'before_isolation_scope': 1}
E     
E     Right contains 1 more item:
E     {'before_isolation_scope': 1}
E     
E     Full diff:
E     + {}
E     - {
E     -     'before_isolation_scope': 1,
E     - }

tests.test_scope test_with_new_scope

Flake rate in main: 96.98% (Passed 8 times, Failed 257 times)

Stack Traces | 0.001s run time

tests/test_scope.py:587: in test_with_new_scope
    assert scope is in_with_current_scope
E   assert <PotelScope id=0x7fa16c8214f0 name=None type=ScopeType.CURRENT> is <Scope id=0x7fa1801aeac0 name=None type=ScopeType.CURRENT>

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