GH-33874: [Java] Ensure custom headers are included during JDBC auth handshake #33946
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Rationale for this change
The expectation is that any custom properties set on the JDBC connection are sent across on every request. This PR ensures the handshake request gets those headers as well.
What changes are included in this PR?
Ensure custom headers are sent during auth handshake
Are these changes tested?
No, not sure where the best place to test this.
Are there any user-facing changes?
No, other than seeing expected behavior.