[FIX][PATCH] Aave Close Bug

[zerotucks]

Description of Changes

Please list the changes introduced by this PR:

• Updated Close Multiply on AAVE to use shared/common helpers for determining swap data
• Clean up remaining code in close strategy

How to Test

Please provide instructions on how to test the changes in this PR:

• Open /ethereum/aave/v3/borrow/usdcwbtc#simulate
• Setup a fork on tenderly
• Grab some USDC https://www.notion.so/oazo/Getting-load-of-tokens-on-a-fork-a0dd765655f34a9695856f646eb6593f?pvs=4
• Open a position
• Close position and see that Close to Coll and Debt work as expected

PR Definition of Done

Please ensure the following requirements have been met before marking the PR as ready for review:

• All checks are passing
• PR is linked to a corresponding ticket
• PR title is clear and concise
• Code has been self-reviewed and any fixes or improvements noted (See Code review standards in Notion)
• Documentation has been updated if necessary

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