[DOC]: Include link to contributing guide and CI overview docs in automated CI comment

### Is this a duplicate?

- [X] I confirmed there appear to be no [duplicate issues](https://github.com/NVIDIA/cccl/issues) for this bug and that I agree to the [Code of Conduct](CODE_OF_CONDUCT.md)

### Is this for new documentation, or an update to existing docs?

New

### Describe the incorrect/future/missing documentation

In the comment left whenever CI completes (whether success or failure), it should include a link to our contributing guide and our CI overview to improve discoverability for first time or irregular contributors.

https://github.com/NVIDIA/cccl/blob/main/CONTRIBUTING.md
https://github.com/NVIDIA/cccl/blob/main/ci-overview.md

### If this is a correction, please provide a link to the incorrect documentation. If this is a new documentation request, please link to where you have looked.

_No response_