feat(seer): Update default triggers for Code Review

[ryan953]

Fixes https://linear.app/getsentry/issue/CW-1131/update-code-review-default-triggers

[github-actions]

🚨 Warning: This pull request contains Frontend and Backend changes!

It's discouraged to make changes to Sentry's Frontend and Backend in a single pull request. The Frontend and Backend are not atomically deployed. If the changes are interdependent of each other, they must be separated into two pull requests and be made forward or backwards compatible, such that the Backend or Frontend can be safely deployed independently.

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[linear-code]

CW-1131 Update Code Review default triggers

[bruno-garcia]

We need the UX on top to be clear to the user what they are getting

[getsentry-bot]

PR reverted: e24356d

[ryan953]

Reverted because of failing test. The selective test runner missed it, and so master CI failed.

Reverted to unblock, re-implemented in #111911

[github-actions]

Backend Test Failures

Failures on 128112a in this run:

tests/sentry/integrations/api/endpoints/test_organization_repository_details.py::OrganizationRepositoryGetTest::test_get_repository_expand_settings_no_settings_exist — log

[gw1] linux -- Python 3.13.1 /home/runner/work/sentry/sentry/.venv/bin/python3
tests/sentry/integrations/api/endpoints/test_organization_repository_details.py:91: in test_get_repository_expand_settings_no_settings_exist
    assert response.data["settings"]["codeReviewTriggers"] == [
E   AssertionError: assert ['on_ready_for_review'] == ['on_ready_fo...n_new_commit']
E     
E     Right contains one more item: 'on_new_commit'
E     
E     Full diff:
E       [
E           'on_ready_for_review',
E     -     'on_new_commit',
E       ]