Fix bug of converting system properties from EventData to Spring message in Eventhub binder

[yiliuTo]

This pr is to fix the bug in #22446 , when converting a EventData to Spring message, not all system properties of EventData are transfered to Spirng msg.

[yiliuTo]

/azp run java - spring - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[yiliuTo]

/azp run java - spring - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[yiliuTo]

/azp run java - spring - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

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[backwind1233]

LGTM

[chenrujun]

LGTM.