fix(jira): use paginated project endpoint in get_organization_config

[sentry-junior]

Problem

The Jira integration settings page (e.g. /settings/integrations/jira/{id}/) spins forever for large Jira instances. Root cause: get_organization_config() calls get_projects_list(), which hits the deprecated unpaginated GET /rest/api/2/project endpoint. For enterprise instances with hundreds or thousands of projects this request times out before it can return, leaving the page in an infinite loading state.

Reported by Doctolib (enterprise customer). Existing issue: #95257.

Fix

Replace the get_projects_list() call with get_projects_paginated(params={"maxResults": 50}), capping the initial settings-page render to the first 50 projects. The existing typeahead search endpoint (JiraSearchEndpoint) already uses the paginated API with a query filter, so users can find any project not in the initial 50 by typing in the dropdown.

The 50 bound also ensures large instances (> 10 projects) still take the global-status fallback path in _set_status_choices_in_organization_config, preserving existing behavior.

What was verified

• Added test_get_organization_config_uses_paginated_endpoint to confirm the paginated /project/search endpoint is hit (not the legacy /project) and that addDropdown.items is populated correctly.
• Existing test_get_config_data / test_get_config_data_issue_keys are unaffected — they test get_config_data() which calls _filter_active_projects() → get_projects_list(), a separate code path not changed here.
• Could not run the full test suite locally; CI will confirm.

Out of scope

get_project_key_for_id() and _filter_active_projects() also call get_projects_list() and have the same underlying issue; those are separate follow-up candidates.

Fixes #95257

---

View Session in Sentry

Action taken on behalf of Nick Meisenheimer.

[github-actions]

Backend Test Failures

Failures on b71f9fb in this run:

tests/sentry/integrations/jira/test_integration.py::JiraIntegrationTest::test_get_organization_config_uses_paginated_endpoint — log

[gw1] linux -- Python 3.13.1 /home/runner/work/sentry/sentry/.venv/bin/python3
tests/sentry/integrations/jira/test_integration.py:1250: in test_get_organization_config_uses_paginated_endpoint
    assert len(add_dropdown_items) == 2
E   assert 0 == 2
E    +  where 0 = len([])