Gitlab project label/labels datasource implementation

Krzysztof Grzemparequested to merge
gitlab-community/gitlab-org/terraform-provider-gitlab:feat/datasource_gitlab_project_label into main

This MR is introducing gitlab_project_labels and gitlab_project_label datasources for retrieving labels from projects.

Related issue Support for reading project labels (#6645 - closed)

Edited by Deepika Guliani

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