WIP Unit tests for OUSD Simplified strategy

[sparrowDom]

• fixes checkBalance message value that gets sent to master strategy on withdrawal
• simplifies the recipient check in the relay function
• TODO: we might need to move Withdrawal event emission to onTokensReceived in Master strategy
• adds approval of exact amount before depositing to Morpho Vault. We could stick with approving uint256.max?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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##             shah/cross-chain-strategy-cctpv2    #2724   +/-   ##
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  Files                                       ?      133           
  Lines                                       ?     6117           
  Branches                                    ?     1628           
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  Hits                                        ?     2536           
  Misses                                      ?     3578           
  Partials                                    ?        3           

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