HDFS-13916. Distcp SnapshotDiff to support WebHDFS.

[sadanand48]

Description of PR

Backport of change HDFS-13916 into branch-3.3

How was this patch tested?

Unit tests.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	11m 8s		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.
			_ branch-3.3 Compile Tests _
+1 💚	mvninstall	53m 32s		branch-3.3 passed
+1 💚	compile	0m 28s		branch-3.3 passed
+1 💚	checkstyle	0m 26s		branch-3.3 passed
+1 💚	mvnsite	0m 34s		branch-3.3 passed
+1 💚	javadoc	0m 29s		branch-3.3 passed
+1 💚	spotbugs	0m 54s		branch-3.3 passed
+1 💚	shadedclient	40m 12s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 31s		the patch passed
+1 💚	compile	0m 22s		the patch passed
+1 💚	javac	0m 22s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 15s		the patch passed
+1 💚	mvnsite	0m 25s		the patch passed
+1 💚	javadoc	0m 18s		the patch passed
+1 💚	spotbugs	0m 51s		the patch passed
+1 💚	shadedclient	39m 49s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	16m 24s		hadoop-distcp in the patch passed.
+1 💚	asflicense	0m 34s		The patch does not generate ASF License warnings.
		170m 25s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5839/1/artifact/out/Dockerfile
GITHUB PR	#5839
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 2bd1471917a2 4.15.0-212-generic #223-Ubuntu SMP Tue May 23 13:09:22 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	branch-3.3 / 87d07dc
Default Java	Private Build-1.8.0_362-8u372-gaus1-0ubuntu118.04-b09
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5839/1/testReport/
Max. process+thread count	592 (vs. ulimit of 5500)
modules	C: hadoop-tools/hadoop-distcp U: hadoop-tools/hadoop-distcp
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5839/1/console
versions	git=2.17.1 maven=3.6.0 spotbugs=4.2.2
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[simbadzina]

LGTM.
Merge conflict in TestDistCpSync.java was resolved correctly.