feat: Document the class path / classloader issue with the shuffle manager #578

Job	Run time
ubuntu-latest/java 8-spark-3.4/rust	5m 31s
ubuntu-latest/java 8-spark-3.4/java	46m 32s
ubuntu-latest/java 17-spark-3.4/rust	6m 3s
ubuntu-latest/java 8-spark-3.2/java	45m 52s
ubuntu-latest/java 17-spark-3.4/java	46m 15s
ubuntu-latest/java 8-spark-3.3/java	49m 14s
macos-14(Silicon)/java 8-spark-3.4/rust	4m 16s
ubuntu-latest/java 11-spark-3.3/java	49m 38s
ubuntu-latest/java 17-spark-3.3/java	45m 32s
macos-14(Silicon)/java 8-spark-3.4/java	31m 31s
macos-14(Silicon)/java 17-spark-3.4/rust	4m 19s
macos-14(Silicon)/java 17-spark-3.4/java	32m 24s
macos-14(Silicon)/java 8-spark-3.2/java	30m 12s
macos-14(Silicon)/java 17-spark-3.3/java	30m 19s
${{ matrix.os }}/java ${{ matrix.java_version }}-spark-${{ matrix.spark-version }}/${{ matrix.test-target }}	0s
	7h 7m 38s

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