feat: Improve tests of position_utils library.

[zarboq]

Feature Request

Tests for the following functions are missing:

• will_collateral_be_sufficient()
• update_funding_and_borrowing_state()

Add tests for them.

Describe Preferred Solution

Add tests in tests/position/test_position_utils.cairo file

[FelixGibson]

I'd like to help with this

[zarboq]

Sure, I assigned you !

[codekaya]

I'd like to assign on this