Add parameter ci_display_pipeline_variables in gitlab_project
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Label this issue](https://contributors.gitlab.com/manage-issue?action=label&projectId=40916776&issueIid=6793) </details> <!--IssueSummary end--> 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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