Add `custom_headers` support to `gitlab_group_hook` and `gitlab_project_hook`

Patrick Ricerequested to merge
custom-headers-support-on-hooks into main
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This code update introduces a new feature that allows users to specify custom headers for GitLab group webhooks. Users can now define key-value pairs to be included in the webhook requests, providing more flexibility and control over the data sent to external services. Additionally, the code improves the handling of custom headers during resource updates, ensuring that existing values are preserved if not explicitly specified in the updated configuration.

Closes #6353 (closed)

Edited by Patrick Rice

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