ref(cells): Implement org member invite redirect from old path to new

[lynnagara]

We have to support the old invite urls for up to INVITE_DAYS_VALID (30 days) however putting this web redirect in place now allows us to clean up the rest of the frontend and api logic and other settings (such as is_historical_monolith_region handling) that was all connected to the legacy route.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit f77e5e9. Configure here.}

[github-actions]

Backend Test Failures

Failures on e244009 in this run:

tests/sentry/web/frontend/test_accept_organization_invite_redirect.py::AcceptOrganizationInviteRedirectViewTest::test_redirects_legacy_invite_to_org_scoped_route — log

[gw0] linux -- Python 3.13.1 /home/runner/work/sentry/sentry/.venv/bin/python3
tests/sentry/web/frontend/test_accept_organization_invite_redirect.py:17: in test_redirects_legacy_invite_to_org_scoped_route
    assert response.status_code == 302
E   assert 200 == 302
E    +  where 200 = <HttpResponse status_code=200, "text/html">.status_code

[github-actions]

Backend Test Failures

Failures on c5a9bc8 in this run:

tests/sentry/web/frontend/test_accept_organization_invite_redirect.py::AcceptOrganizationInviteRedirectViewTest::test_redirects_legacy_invite_to_org_scoped_route — log

[gw1] linux -- Python 3.13.1 /home/runner/work/sentry/sentry/.venv/bin/python3
tests/sentry/web/frontend/test_accept_organization_invite_redirect.py:17: in test_redirects_legacy_invite_to_org_scoped_route
    assert response.status_code == 302
E   assert 200 == 302
E    +  where 200 = <HttpResponse status_code=200, "text/html">.status_code