Add browser console banner as easter egg

What does this MR do?

This MR adds banner in browser console.

Why was this MR needed?

We're a developer product company, and while this MR doesn't particular add any technical benefits to the product, it is cool to have as it;

• Shows ASCII art Tanuki logo in color (similar to GDK server)
• Links to our Contributing page.
• Links to our Jobs page.

Screenshots

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Conform by the code review guidelines
  • Has been reviewed by a Frontend maintainer
• Conform by the merge request performance guides
• Conform by the style guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them

What are the relevant issue numbers?

Closes #48813 (moved)