fix: validation mode for checking if colony url exists form

[bassgeta]

Description

I solved this by comparing it to the colony name creation, figuring out that one works and this one doesn't, what's the difference?
Well basically it wasn't a race condition, but it instead "revalidated" when the field changed focus 🫠

Testing

1. Run the create data script
2. Run node ./scripts/create-colony-url.js and open the URL
   
3. Into the URL field, enter planex and wait for this to appear
   
4. Enter something else and URL should be available
   

Notice how you don't see the URL available flashing into URL already taken behaviour described in the original issue

Diffs

Changes 🏗

• onChange revalidation mode to the colony name step

Resolves #3309

[iamsamgibbs]

What a lovely simple fix. 10 / 10

Screen.Recording.2024-10-22.at.17.03.02.mov

[rumzledz]

Clean fix! ✨

[rdig]

Very nice!

Screencast.from.2024-10-23.14-07-55.mp4