ref(flags): Graduate organizations:integrations-github_enterprise-project-management

[wedamija]

GA flag rolled out to 100%. Remove the flag and make the gated behavior unconditional.

[sentry]

Bug: The check_feature_flag method in GitHubIssueSyncSpec still references the removed organizations:integrations-github_enterprise-project-management flag, which will break GitHub Enterprise issue syncing.
_{Severity: CRITICAL}

Suggested Fix

The call to check_feature_flag() in get_resolve_sync_action() within src/sentry/integrations/github/issue_sync.py should be removed. The logic should be made unconditional to reflect the feature flag's graduation, similar to the changes made in src/sentry/integrations/utils/sync.py.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: src/sentry/features/temporary.py#L137-L142

Potential issue: The removal of the
`organizations:integrations-github_enterprise-project-management` feature flag from
`src/sentry/features/temporary.py` was incomplete. A reference to this flag remains in
`src/sentry/integrations/github/issue_sync.py` within the `check_feature_flag` method.
Because the flag is no longer registered, the `features.has()` call will catch a
`FeatureNotRegistered` exception and return `False`. This causes
`get_resolve_sync_action()` to always return `ResolveSyncAction.NOOP`, which will
silently disable issue status synchronization (resolve/unresolve) from GitHub webhooks
for all GitHub Enterprise integrations.

Also affects:

• src/sentry/integrations/utils/sync.py:43~49

_{Did we get this right? 👍 / 👎 to inform future reviews.}

[github-actions]

Backend Test Failures

Failures on 1b83f17 in this run:

tests/sentry/issues/escalating/test_escalating.py::HistoricGroupCounts::test_query_single_group — log

[gw0] linux -- Python 3.13.1 /home/runner/work/sentry/sentry/.venv/bin/python3
tests/sentry/issues/escalating/test_escalating.py:92: in test_query_single_group
    assert query_groups_past_counts(Group.objects.all()) == [
E   AssertionError: assert [] == [{'count()': ...236675997712}]
E     
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E     
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E     �[91m- [�[39;49;00m�[90m�[39;49;00m
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E     �[91m-         'hourBucket': '2026-06-01T06:00:00+00:00',�[39;49;00m�[90m�[39;49;00m
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