feat: Add ci_display_pipeline_variables parameter to gitlab_project

Gatla Vishweshwar Reddyrequested to merge
gitlab-community/gitlab-org/terraform-provider-gitlab:feat/ci-display-pipeline-variables into main

## What does this MR do and why?

Adds the `ci_display_pipeline_variables` boolean attribute to:

- `gitlab_project` resource

  • `gitlab_project` data source

  • `gitlab_projects` data source

This attribute controls whether pipeline variables are shown on the pipeline details page. Introduced in GitLab 17.8.

The attribute is handled in `updatePostCreateEditOptions` since it can only be set on project update, not on create.

Closes #6793 (closed)

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