[BB-10523] Add Reset to each node and change "Undo" text

[pkulkark]

Description

This PR makes the following changes:

1. Replaces the "enable hint" settings with "enable reset" - This change was designed as part of the RenPy Designs but adding it here as per the request.
2. Rename "Undo" to "Go Back" - This was also included in the RenPy Designs but adding it here as requested.
3. Display "Reset" button on all nodes except the first one.

Supporting Information

OpenCraft Internal Jira task: BB-10523

Testing Instructions

1. Deploy this branch of the XBlock.
2. Set up a few nodes with hints and few without hints.
3. Verify that adding hints results in hints showing up in LMS, otherwise it doesn't.
4. Enable reset option in settings and confirm that "Reset" button shows up on all nodes except the first one.
5. Verify that clicking "Reset" clears the state and user returns to the first node.

[farhaanbukhsh]

👍

✅ I tested this on Tutor devstack

• Tested reset functionality
• Tested back with reset
• Tested back without reset
• Tested reset without back
  ✅ I read through the code
  ✅ I checked for accessibility issues
  ❌ Includes documentation