HADOOP-19444: ABFS: [FnsOverBlob][Tests] Add Tests For Negative Scenarios Identified for Ingress Operations

[anmolanmol1234]

This PR covers 2 changes:-

1. Removed the need for an additional list for storing the committedBlockEntries and replaced it with a string builder which is then cleared out during outputstream close.
2. Added tests for the negative scenarios identified for the append flush cases.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	1m 8s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	detsecrets	0m 1s		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 3 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	41m 24s		trunk passed
+1 💚	compile	0m 43s		trunk passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04
+1 💚	compile	0m 35s		trunk passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
+1 💚	checkstyle	0m 31s		trunk passed
+1 💚	mvnsite	0m 41s		trunk passed
+1 💚	javadoc	0m 40s		trunk passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04
+1 💚	javadoc	0m 34s		trunk passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
+1 💚	spotbugs	1m 10s		trunk passed
+1 💚	shadedclient	39m 0s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 30s		the patch passed
+1 💚	compile	0m 33s		the patch passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04
+1 💚	javac	0m 33s		the patch passed
+1 💚	compile	0m 28s		the patch passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
+1 💚	javac	0m 28s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	0m 20s	/results-checkstyle-hadoop-tools_hadoop-azure.txt	hadoop-tools/hadoop-azure: The patch generated 3 new + 11 unchanged - 0 fixed = 14 total (was 11)
+1 💚	mvnsite	0m 31s		the patch passed
+1 💚	javadoc	0m 29s		the patch passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04
+1 💚	javadoc	0m 25s		the patch passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
+1 💚	spotbugs	1m 6s		the patch passed
+1 💚	shadedclient	38m 38s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	2m 58s		hadoop-azure in the patch passed.
+1 💚	asflicense	0m 36s		The patch does not generate ASF License warnings.
		134m 26s

Subsystem	Report/Notes
Docker	ClientAPI=1.48 ServerAPI=1.48 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7424/1/artifact/out/Dockerfile
GITHUB PR	#7424
JIRA Issue	HADOOP-19444
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 865901031f1d 5.15.0-130-generic #140-Ubuntu SMP Wed Dec 18 17:59:53 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 6039e0e
Default Java	Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7424/1/testReport/
Max. process+thread count	524 (vs. ulimit of 5500)
modules	C: hadoop-tools/hadoop-azure U: hadoop-tools/hadoop-azure
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7424/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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