Bulk prepare handler is freezing if MONGODB is disabled

[vijayg10]

Summary:
Bulk prepare handler is freezing if MONGODB is disabled

Severity:
(Low, Medium, High)

Priority:
(Critical, Medium, Low)

Expected Behavior
If the MONGODB is expected to be enabled, the bulk prepare handler should report an error at least instead of freezing.

Steps to Reproduce

1. Set the parameter MONGODB.DISABLED to true in bulk prepare handler
2. Try a bulkTransfer
3. The bulk prepare handler consumes first kafka message and then freezes

Specifications

• Component (if known): central-ledger - bulk prepare handler
• Version: v16.3.0
• Bug found/raised by: @vijayg10

Notes:
It seems the mongoose model creation is causing this issue at the following line
https://github.com/mojaloop/central-ledger/blob/2a9c21d3d65cc0641fb285c4a977b6d0e0852584/src/handlers/bulk/prepare/handler.js#L192

File: src/handlers/bulk/prepare/handler.js
BulkTransferModels.getIndividualTransferModel()

[elnyry-sam-k]

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