DGS-22734 Add Accept-Version header

[rayokota]

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What

• Add Accept-Version header
• Minor fix to AWS driver to account for web identity token file
• User newer subject-based DEK creation API
• Properly handle Avro bytes type

Checklist

• Contains customer facing changes? Including API/behavior changes
• Did you add sufficient unit test and/or integration test coverage for this PR?
  • If not, please explain why it is not required

References

JIRA:

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Open questions / Follow-ups

[Copilot]

Pull Request Overview

This PR adds the Accept-Version header to Schema Registry client requests and includes several important fixes: improved AWS KMS driver support for web identity token files, adoption of a newer subject-based DEK creation API with fallback to legacy endpoints, and proper handling of Avro bytes type serialization/deserialization.

Key Changes:

• Added Accept-Version: 8.0 header to all Schema Registry REST API calls
• Updated DEK creation to use newer subject-based API path with 405 fallback
• Fixed Avro bytes type handling to bypass buffer conversion

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
schemaregistry/rest-service.ts	Added Accept-Version header initialization
schemaregistry/rules/encryption/dekregistry/dekregistry-client.ts	Refactored DEK creation to support subject-based API with legacy fallback
schemaregistry/rules/encryption/awskms/aws-driver.ts	Added web identity token file check to credential provider logic
schemaregistry/serde/avro.ts	Added special handling for bytes type in serialization/deserialization
schemaregistry/test/serde/avro.spec.ts	Added test case for bytes type serialization

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