[Create Instance Page] Adds name suggestions buttons

Overview

This MR adds some clickable name suggestions when users' instance name input already exists. These suggestions are built by appending the username, date and also a random pet name.

Partial fix for: #522 (closed)

How to Test

Navigate to the create instance page and use an existing instance name (You can get one by navigating to the instances page and copying any of the listed names). After you input the existing name you should see a warning message that indicates the duplication as well as some name suggestion buttons that allows the user to select a name for the instance they are trying to create. You should still be able to create the instance with this name.

Screenshots