Use scoped profile routes by default

What does this MR do?

Next step on !45045 (merged).

Make /-/profile a default route in UI. Keep serving /profile too. It's fine we have docs and specs pointing to /profile still. We address it in next iteration.

For #210024.

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