Add parameter ci_display_pipeline_variables in gitlab_project
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in Resource or Data gitlab_project add parameter ci_display_pipeline_variables available in the API
## Implementation Guide
- Follow the `CONTRIBUTING.md` guide for setting up your local development environment.
- Clone the community fork of this project.
- In `internal/provider/sdk/resource_gitlab_project.go`, add a new attribute called `ci_display_pipeline_variables`. It can only be set on an update to a project, so for the create function, it will need to be sent to the API in `updatePostCreateEditOptions`.
- Add the same attribute to `internal/provider/sdk/data_source_gitlab_projects.go` and `internal/provider/datasource_gitlab_project.go`.
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