NIFI-15359 - Upgrade S3 Encryption Client to 4.0.0

[pvillard31]

Summary

NIFI-15359 - Upgrade S3 Encryption Client to 4.0.0

It includes a breaking change as explained here:

https://github.com/aws/amazon-s3-encryption-client-java/releases/tag/v4.0.0

builderV4() now defaults to commitmentPolicy (REQUIRE_ENCRYPT_REQUIRE_DECRYPT) and encryptionAlgorithm (ALG_AES_256_GCM_HKDF_SHA512_COMMIT_KEY)

It means that we may be in a situation where we could not decrypt existing data with FetchS3 because of the new default.

Proposition is to expose a new property for the user to select the commitment policy but to still apply the new default of the client given the security posture that it implies.

The recommendation for the user, would be to set the property with:

Scenario	Recommended Policy
New deployment (no legacy data)	Require Encrypt Require Decrypt (default)
Migration period (need to read legacy + write new)	Require Encrypt Allow Decrypt
Read-only access to legacy data	Forbid Encrypt Allow Decrypt

This breaking change would be documented in the migration guide with guidance on what value to select for this new property if needed.

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