Refactor test file imports by removing duplicates and standardizing order

[gkfyr]

Related Issue

closes #950

Description of Changes

• Removed duplicate import statements in /test.
• Reordered imports following a structured approach:
  1. External dependencies
  2. Utilities
  3. Types
  4. Interfaces
  5. Libraries
  6. Contracts
  7. Test files
• Within each category, imports are sorted alphabetically.
• Ensured consistent formatting with no unnecessary blank lines between imports.

[0xb10ckdev]

If you want to standardizing order, it should be ordered alphabetically

Suggested change

	import {PoolId} from "../src/types/PoolId.sol";
	import {IPoolManager} from "../src/interfaces/IPoolManager.sol";
	import {Currency} from "../src/types/Currency.sol";
	import {BalanceDelta} from "../src/types/BalanceDelta.sol";
	import {BalanceDelta} from "../src/types/BalanceDelta.sol";
	import {Currency} from "../src/types/Currency.sol";
	import {PoolId} from "../src/types/PoolId.sol";

[gkfyr]

I reordered the imports alphabetically and pushed a new commit. Thanks! :)