HDFS-17586. Fix timestamp in rbfbalance tool.

[huangzhaobo99]

Description of PR

When the 'Federation Balance' Tool calls the 'DistCp' tool, the timestamp is not retained.

How was this patch tested?

Add UT

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 20s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	32m 30s		trunk passed
+1 💚	compile	0m 19s		trunk passed with JDK Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2
+1 💚	compile	0m 18s		trunk passed with JDK Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08
+1 💚	checkstyle	0m 17s		trunk passed
+1 💚	mvnsite	0m 19s		trunk passed
+1 💚	javadoc	0m 23s		trunk passed with JDK Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2
+1 💚	javadoc	0m 20s		trunk passed with JDK Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08
+1 💚	spotbugs	0m 35s		trunk passed
+1 💚	shadedclient	20m 3s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 15s		the patch passed
+1 💚	compile	0m 13s		the patch passed with JDK Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2
+1 💚	javac	0m 13s		the patch passed
+1 💚	compile	0m 14s		the patch passed with JDK Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08
+1 💚	javac	0m 14s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 9s		the patch passed
+1 💚	mvnsite	0m 14s		the patch passed
+1 💚	javadoc	0m 14s		the patch passed with JDK Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2
+1 💚	javadoc	0m 13s		the patch passed with JDK Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08
+1 💚	spotbugs	0m 32s		the patch passed
+1 💚	shadedclient	20m 1s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	1m 55s		hadoop-federation-balance in the patch passed.
+1 💚	asflicense	0m 25s		The patch does not generate ASF License warnings.
		81m 3s

Subsystem	Report/Notes
Docker	ClientAPI=1.46 ServerAPI=1.46 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6952/1/artifact/out/Dockerfile
GITHUB PR	#6952
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 78d8c0a22319 5.15.0-106-generic #116-Ubuntu SMP Wed Apr 17 09:17:56 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 362be88
Default Java	Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.23+9-post-Ubuntu-1ubuntu120.04.2 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_412-8u412-ga-1~20.04.1-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6952/1/testReport/
Max. process+thread count	557 (vs. ulimit of 5500)
modules	C: hadoop-tools/hadoop-federation-balance U: hadoop-tools/hadoop-federation-balance
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6952/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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