chore(issues): Begin migrating ownership rules limits to flagpole

[mrduncan]

XLARGE is not used yet and won't be enabled without additional research/testing (and possibly changing the actual value).

Old check will get removed once the values are migrated over to flagpole.

[codecov[bot]]

:x: 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
21728	1	21727	214

View the top 1 failed tests by shortest run time

tests.sentry.api.endpoints.test_project_ownership.ProjectOwnershipEndpointTestCase test_max_raw_length

Stack Traces | 4.81s run time

#x1B[1m#x1B[.../api/endpoints/test_project_ownership.py#x1B[0m:375: in test_max_raw_length
    with mock.patch("sentry.api.endpoints.project_ownership.LARGE_RAW_LENGTH", 10):
#x1B[1m#x1B[.../hostedtoolcache/Python/3.12.6....../x64/lib/python3.12/unittest/mock.py#x1B[0m:1461: in __enter__
    original, local = self.get_original()
#x1B[1m#x1B[.../hostedtoolcache/Python/3.12.6....../x64/lib/python3.12/unittest/mock.py#x1B[0m:1434: in get_original
    raise AttributeError(
#x1B[1m#x1B[31mE   AttributeError: <module 'sentry.api.endpoints.project_ownership' from '.../api/endpoints/project_ownership.py'> does not have the attribute 'LARGE_RAW_LENGTH'#x1B[0m

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