Remove special naming of pipelines folder

What does this MR do?

Pipelines folder was named vue_pipelines_index which does not match any pattern we have. Renaming it to pipelines to match current pattern.

Does this MR meet the acceptance criteria?

• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together