WebIDE: Fix Commit bugs

What does this MR do?

• Error handling on commit
• Showing commit results in the flash message
• Flash Message Positioning fixed
• Reset data after commit properly
• Loading Icon Jumping
• Firefox scrolling issue
• Open changed file again
• Show Actual Commit Error message
• Show Complete Monaco Setup Error Message
• Merge Request redirect box hidden
• Defensive Error Handling on Editor Setup
• Fix of Header Width

Why was this MR needed?

To make the Web IDE smoother and better.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Review
  • Has been reviewed by Frontend
• Squashed related commits together

What are the relevant issue numbers?

#42200 (closed)