[fix]: Implement Option 3 in the field name discussion

[zhongkechen]

What would you like?

Implement Option 3 in #438

Use the same field name executionArn in DurableLogger as the other SDKs do

Possible Implementation

No response

Is this a breaking change?

No

Does this require an RFC?

No

Additional Context

No response

[zhongkechen]

Python log fields

{
  "timestamp": "2026-06-15T22:00:09Z",
  "level": "INFO",
  "message": "Hello from my_step",
  "logger": "root",
  "requestId": "a13a0202-3f63-4138-8211-3642ece58a09",
  "executionArn": "arn:aws:lambda:us-east-1:983730555296:function:testDurableFunction:$LATEST/durable-execution/58480652-e22c-4770-8777-6fc61f9f791e/b3cb2b94-566c-31bb-8985-a34a05a4a0bb",
  "operationName": "my_step",
  "attempt": 1,
  "operationId": "1ced8f5be2db23a6513eba4d819c73806424748a7bc6fa0d792cc1c7d1775a97"
}

JS log fields

{
  "requestId": "06146b13-6db2-48c6-bfee-30f2cac50a3c",
  "timestamp": "2026-06-15T22:27:51.089Z",
  "level": "INFO",
  "executionArn": "arn:aws:lambda:us-east-1:983730555296:function:testJSFunction:$LATEST/durable-execution/4e31ccf1-ac3b-4be8-ab80-afb096ae3690/28e41a0a-68f6-37a6-a249-13b1d6881e01",
  "operationId": "c4ca4238a0b92382",
  "attempt": 1,
  "message": "Hello from step #1"
}

Java SDK is using the following field names for context:

    static final String MDC_CONTEXT_ID = "contextId";
    static final String MDC_CONTEXT_NAME = "contextName";