💡 [REQUEST] - Document everything going on in GCP project `slo-generator-ci-a2b4`

### Summary

There is a lot going on in `slo-generator-ci-a2b4` regarding CI and testing in general. Document and version everything for traceability and reproducibility.

### Basic Example

- Document everything related to the `slo-generator` Cloud Run service used to test new releases, the Cloud Scheduler Jobs used to simulate traffic, the Uptime Checks and the SLO definitions for alerting...
- Migrate resources created manually to infra-as-code, for example with Terraform.

### Screenshots

```bash
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### Drawbacks

None I can think of.

### Unresolved questions

_No response_

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct