Performance: Add `LoadingSpinner` delay

Created by: umpox

Actions before merging this PR

• delay is currently set to always be enabled, we probably don't want this. Change to default false and update usage in our codebase to update it in key places:
  • Key places IMO = In between routes, so we can look at places like here (and more)
• Experiment with different delay times, we try 300ms here, what does 500ms feel like, and so on. Speak with @quinnkeast about this

Description

Adds a delay to LoadingSpinner so it doesn't render immediately:

App preview:

• Web

Check out the client app preview documentation to learn more.