remove teachers from allotment when ltp is zero

[RoguedBear]

closes #105, #84

Description

i tried to write migrations, to remove existing zero-ltp allotment entries. i give up :sob: . mongoose + javascript async/await are a formidable foe, capable of ruining an average person's day simply by existing.

so for now, existing entries wont be deleted unless commit_ltp is called on them

Checklist:

• [x] My commits are related to the pull request and look clean.
• [ ] I have made mostly use of tailwind as many places as possible.
• [x] I have added comments on any confusing or complex pieces of code.
• [x] I have commented the console logs.
• [x] I have tested the changes at my end.
• [x] I have requested for review.
• [x] I have linked the commits/PR to issue.

[Chirag4904]

yep perfectly fine like right now it's an issue bcoz data is already saved but in the new system if this happens at committing ltp time then it's perfectly fine.