Generate catalog json

What does this MR do and why?

As per https://gitlab.com/gitlab-data/analytics/-/issues/22464#note_2300760375, we want to generate a catalog.json that would contain a complete cloud connector structure in a single json file.

It would be generate similar to the legacy cloud_connector.yml file (every time when main branch is merged)

And the data analytics team would access it on the following url:

https://gitlab.com/api/v4/projects/58733651/jobs/artifacts/main/raw/config/catalog.json?job=generate_catalog_json

Related to: #53 (closed)

References

Please include cross links to any resources that are relevant to this MR. This will give reviewers and future readers helpful context to give an efficient review of the changes introduced.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.