fix: Use `makeCopy` to change relation in `FileSourceScanExec` #400

Job	Run time
macos-14(Silicon)/java 8-spark-3.4/rust	4m 37s
ubuntu-latest/java 8-spark-3.2/java	4m 5s
ubuntu-latest/java 8-spark-3.4/rust	4m 45s
macos-14(Silicon)/java 8-spark-3.4/java	4m 28s
macos-14(Silicon)/java 8-spark-3.2/java	3m 23s
ubuntu-latest/java 8-spark-3.3/java	3m 56s
ubuntu-latest/java 8-spark-3.4/java	3m 50s
macos-14(Silicon)/java 17-spark-3.4/rust	4m 41s
macos-14(Silicon)/java 17-spark-3.3/java	3m 28s
ubuntu-latest/java 17-spark-3.4/rust	4m 41s
ubuntu-latest/java 11-spark-3.3/java	4m 8s
macos-14(Silicon)/java 17-spark-3.4/java	3m 43s
ubuntu-latest/java 17-spark-3.4/java	3m 59s
ubuntu-latest/java 17-spark-3.3/java	4m 2s
${{ matrix.os }}/java ${{ matrix.java_version }}-spark-${{ matrix.spark-version }}/${{ matrix.test-target }}	0s
	57m 46s

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