Resolve "Better UX for Project Creation"

What does this MR do?

This MR introduces new Vue-based UI for project creation hidden behind experiment flag

To test this locally append ?force_experiment=new_create_project_ui to URL

Screenshots

Entry	Before	After
Welcome page	N/A
Nested page
Nested page(mobile)

Video (desktop): desktop

Video (mobile): mobile

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Related issues: #210599 (closed) #218478 (closed)