test(ata): add integration for private accounts create public ATAs

[0x-r4bbit]

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[Copilot]

Pull request overview

Adds an integration test ensuring the ATA program can create a public associated token account when the owner is a newly created private account, using a privacy-preserving transaction flow.

Changes:

• Added a new integration test ata_create_from_private_owner that executes/proves an ATA Create instruction with a private owner and public ATA.
• Extended imports in integration_tests/tests/ata.rs to support privacy-preserving transaction execution (proof generation, message/witness construction, and program dependency wiring).

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