GH-48750: [CI][Documentation] Disable Unity build for OpenTelemetry #4166

Job	Run time
check-labels / Check labels	29s
matrix.title	0s
ARM64 Windows 11 MSVC	0s
ODBC	0s
JNI macOS	0s
report-extra-cpp	0s
JNI ${{ matrix.platform.runs-on }} ${{ matrix.platform.arch }}	0s
	29s

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