Ramsundar - Fixed three Functionality issues on the Inventory types page(Backend)

[Ram-blip]

Description

Related PRS (if any):

This backend PR is related to the #5074 frontend PR.

Main changes explained:

• Separated the reusable create flow from the tool create flow.
• Migrated “unit of measurement” storage from the old JSON-file approach to a MongoDB model, The backend now reads, adds, and deletes units through the database.

How to test:

1. check into current branch
2. do npm install and ... to run this PR locally
3. Clear site data/cache
4. log as admin user
5. Go to "http://localhost:5173/bmdashboard/inventorytypes"
6. First check: Go add item in reusables, items will get added in reusables, there is no need to refresh, it updates immediately. Do the same thing for tools.
7. Second check: Go to unit of measurement, add any measurement, it will get added. Also, the delete will also work. Error page won't come.

Screenshots or videos of changes:

Video Proof After changes:
https://www.loom.com/share/c1f26c4fe96241c2b5c6cb107c69b955

Note:

Include the information the reviewers need to know.

[sonarqubecloud]

Quality Gate failed

Failed conditions
13.0% Duplication on New Code (required ≤ 3%)
D Security Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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[Ram-blip]

Redone with this PR: #2210