LMS setting sync for LEARNING_ASSISTANT_PROMPT_TEMPLATE

[robrap]

Ensure that LEARNING_ASSISTANT_PROMPT_TEMPLATE is valid and matches in ec2 and k8s.

Note: This only affects a single setting. However, it seems quite possible that its value could be updated, and would get out of sync without anyone knowing without this fix.

Acceptance Criteria:

• Fix LEARNING_ASSISTANT_PROMPT_TEMPLATE handling in setting sync script.

Notes/Questions:

• This ticket is blocked on Enable setting sync for lms stage #1025, and was broken out of this ticket.
• LEARNING_ASSISTANT_PROMPT_TEMPLATE should be removed from EXCLUDED_PATHS, and possibly replaced with special compare logic that handles the differences that were introduced in https://github.com/edx/edx-internal/pull/12679/files.
• [question] Does the LEARNING_ASSISTANT_PROMPT_TEMPLATE setting also need a separate more permanent check to ensure it is formatted properly and won't break in the future?
• [question] Alternatively, why do we use jinja on the yaml file, and is there a better design to accomplish the same?