Check ci_display_pipeline_variables before rendering manual_variables page

Anna Vovchenkorequested to merge
561706-follow-up-from-adds-fe-for-ui-setting into master

What does this MR do and why?

This MR adds a check to the pipelines controller to only render the manual_variables page if the ci_display_pipeline_variables setting is enabled. This way, we can remove the additional check in the Vue component.

References

Screenshots or screen recordings

Before After
Screenshot_2025-09-04_at_11.22.40 Screenshot_2025-09-04_at_11.26.08

How to set up and validate locally

  1. Visit Project -> Settings -> CI/CD -> Variables and enable the Display manually-defined pipeline variables setting
  2. Visit Build -> Pipelines -> pipeline page and verify the manual variables tab is present
  3. Go back to settings and uncheck the Display manually-defined pipeline variables setting
  4. Visit pipeline page and verify the tab is not present. Visit https://gdk.test:3443/<project_path>/-/pipelines/<pipeline_id>/manual_variables page and verify it returns 404.

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Related to #561706 (closed)

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