Improve Assignment Restricted Element Reporting

[satu0king]

1. Show restricted elements banner only if present
   
2. Show restricted elements across all scopes in assignment preview (when mentor sees)
3. Improve restricted element detection
4. Show warning message when circuit is saved

[ankitkataria]

I'll start working into this. 😄

[satu0king]

Oh, I was going to assign this to myself xD

[ankitkataria]

We can divide work on this one too. Which ones would you want to pick?

[shubhankarsharma00]

Leaving some added information:

• To show Restricted Elements div only when applicable:
  Just add an if statement
  <%if @assignment.restricted_circuit_elements != "None"%>
  

  CircuitVerse/app/views/assignments/show.html.erb

  Lines 38 to 40 in 2898a70

  	<p>
  	<strong>Restricted Circuit Elements:</strong>
  	<p> <%= @assignment.restricted_circuit_elements %> </p><br>