Add gitlab_project_secret_detection_validity_checks resource

Giannis Kepasrequested to merge
gitlab-community/gitlab-org/terraform-provider-gitlab:6587-secret-detection-validity-checks into main

What does this MR do?

Adds gitlab_project_secret_detection_validity_checks resource which manages validity_checks_enabled via the GraphQL setValidityChecks mutation / securityConfiguration query (Ultimate only; not exposed by the REST security settings endpoint).

Changelog: added

Closes #6587 (closed)

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