Add gitlab_project_security_settings resource

Giannis Kepasrequested to merge
gitlab-community/gitlab-org/terraform-provider-gitlab:6587-project-sec-settings into main

What does this MR do?

Add gitlab_project_security_settings resource which wraps the REST project_security_settings API. secret_push_protection_enabled is the only writable attribute; the rest (auto_fix_*, continuous_vulnerability_scans_enabled, container_scanning_for_registry_enabled) are read-only, reflecting current project configuration.

Changelog: added

Edited by Giannis Kepas

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