ServiceHooks in DE are missing Events for updated Sentry Apps

### Environment

SaaS (https://sentry.io/)

### Steps to Reproduce

[This PR](https://github.com/getsentry/sentry/pull/75903) fixed updating `ServiceHooks`, however we have some `ServiceHooks` (read: installations) that were never updated with the new events so they currently don't receive any webhooks.

### Expected Result

Users that installed some Sentry App received the Sentry App's webhooks

### Actual Result

1. Lets make a script to update them. 🤷‍♀

### Product Area

Unknown

### Link

_No response_

### DSN

_No response_

### Version

_No response_

Start by reading PR 75903, which fixed updating ServiceHooks, and inspect how existing ServiceHooks are represented and updated. Identify the script entry point from that change and make it update installations missing the new events; done means affected Sentry App installations receive their webhooks.

Written by the indexing model from the issue text.