Task Description (Required)

With the investigation done in https://issues.redhat.com/browse/DEVHAS-706,  it's feasible to auto-register the webhook for gitlab and push an empty commit to trigger the initial build.

Detailed instructions in here:

https://docs.google.com/document/d/1lQAGJDocKDZVMuvAZswFO4rZh5kyx4dhKRByIyp_YMA/edit

Note:

this requires RHDH 1.2 since 1.2 has the http-request plugin default included in the dynamic plugins

Need to enable:

```
- disabled: false
package: ./dynamic-plugins/dist/roadiehq-scaffolder-backend-module-http-request-dynamic
```

also this requires to configure RHDH with the gitlab api proxy (see above google doc)

blocked by: https://issues.redhat.com/browse/DEVAI-85

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