Resolve ""New project" wizard flow"

What does this MR do?

Updates the frontend for the new project wizard, implements the frontend changes in #54918 (moved), addition of new fields and some tweaks to the UI

• Add a slash between the project url and slug
• Add an expandable section for the additional fields required
  • New field for project avatar
  • New field for license (dropdown)
  • Toggles to set project features: Issues, Wiki, Repository, Snippets, preserving the behaviour in the project settings
• Move the description field to the expandable section
• Update specs
• Add analytics

What are the relevant issue numbers?

#54918 (moved) #57074 (moved)

Feature flag

new_project_advanced_fields

EE Port

ee port

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer

Closes #54918 (moved)