DGS-22077 Handle evolution during field transformation

[rayokota]

What

• Handle evolution during field transformation
• Also change Accept-Version to Confluent-Accept-Unknown-Properties

Checklist

• [Y] Contains customer facing changes? Including API/behavior changes
• [Y] 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:

Test & Review

Open questions / Follow-ups

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[Copilot]

Pull Request Overview

This PR addresses handling of schema evolution when fields are missing during field transformation in Avro serialization/deserialization. The changes ensure that field transformations can proceed even when optional fields with defaults are not present in the message.

Key Changes:

• Modified field transformation logic to skip fields that are not present in the message
• Updated HTTP headers to accept unknown properties from the schema registry
• Added test coverage for transformation of messages with missing optional fields

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/confluent_kafka/schema_registry/common/avro.py	Added check to skip transformation for fields not present in message
src/confluent_kafka/schema_registry/_sync/schema_registry_client.py	Changed HTTP header from Accept-Version to Confluent-Accept-Unknown-Properties
src/confluent_kafka/schema_registry/_async/schema_registry_client.py	Changed HTTP header from Accept-Version to Confluent-Accept-Unknown-Properties
tests/schema_registry/_sync/test_avro_serdes.py	Added test case for field transformation with missing optional field
tests/schema_registry/_async/test_avro_serdes.py	Added test case for field transformation with missing optional field

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