fix: update ephemeral_account dependency and import style

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This pull request updates the sweep_controller contract to improve how it interacts with the ephemeral_account contract. The main changes are focused on dependency management and simplifying cross-contract calls.

Dependency and Import Improvements:

• Added ephemeral_account as a regular dependency in Cargo.toml and removed it from dev-dependencies, ensuring it is always available for the contract, not just during testing.
• Updated the import in lib.rs to use EphemeralAccountContractClient directly from the ephemeral_account crate, simplifying the client usage for cross-contract calls.

Codebase Cleanup:

• Removed the manual re-export and contract import block for ephemeral_account in lib.rs, reducing redundancy and potential for errors. Closes Integration Tests Fail Due to Hardcoded contractimport! Path and Invalid Import #25

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@phertyameen i have fix the bugs