[fix] [common] Fix RawMessageImpl.getProperties() failed when the message metadata contains the same key but with different values #22749

Job	Run time
Preconditions	9s
Build and License check	0s
Build Pulsar java-test-image docker image	0s
Build Pulsar docker image	0s
CI - Unit - ${{ matrix.name }}	0s
CI - Integration - ${{ matrix.name }}	0s
Run CodeQL Analysis	0s
CI - Unit - Upload Coverage	0s
CI - System - ${{ matrix.name }}	0s
CI Flaky - System - ${{ matrix.name }}	0s
CI - Integration - Upload Coverage	0s
Build Pulsar on MacOS	0s
OWASP dependency check	0s
CI - System - Upload Coverage	0s
Delete integration test docker image artifact	0s
Pulsar CI checks completed	7s
Delete system test docker image artifact	0s
	16s

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