Add version sort to tags API

What does this MR do and why?

Contributes to #17801 (closed)

Problem

Tags API doesn't support sort by semantic version.

Solution

• Allow to provide version value to order_by parameter
• Update tags API documentation

How to set up and validate locally

1. Visit http://127.0.0.1:3000/api/v4/projects/2/repository/tags?order_by=version&sort=desc
2. Verify that sort order is correct

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.