feat: reEncryptInstructionFile Implementation (#475)

Implemented the following feature: re-encrypting an instruction file with a new keyring while preserving the original encrypted object in S3. This enables:
1. Key rotation by updating instruction file metadata without re-encrypting object content
2. Sharing encrypted objects with partners by creating new instruction files with a custom suffix using their public keys

Co-authored-by: Anirav Kareddy <[email protected]>

Author: akareddy04

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