TEZ-4613: Remove unused StringBuilder in DAGImpl

[dk2k]

No description provided.

[abstractdog]

if it's not needed, please remove instead of commenting out

[tez-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 10s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
-1 ❌	test4tests	0m 1s	The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
		_ master Compile Tests _
+1 💚	mvninstall	9m 36s	master passed
+1 💚	compile	0m 26s	master passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu122.04
+1 💚	compile	0m 21s	master passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu122.04-b06
+1 💚	checkstyle	0m 50s	master passed
+1 💚	javadoc	0m 21s	master passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu122.04
+1 💚	javadoc	0m 12s	master passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu122.04-b06
+0 🆗	spotbugs	1m 5s	Used deprecated FindBugs config; considering switching to SpotBugs.
+1 💚	findbugs	1m 4s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 18s	the patch passed
+1 💚	compile	0m 18s	the patch passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu122.04
+1 💚	javac	0m 18s	the patch passed
+1 💚	compile	0m 16s	the patch passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu122.04-b06
+1 💚	javac	0m 16s	the patch passed
+1 💚	checkstyle	0m 13s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	javadoc	0m 7s	the patch passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu122.04
+1 💚	javadoc	0m 7s	the patch passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu122.04-b06
+1 💚	findbugs	0m 49s	the patch passed
		_ Other Tests _
+1 💚	unit	4m 17s	tez-dag in the patch passed.
+1 💚	asflicense	0m 11s	The patch does not generate ASF License warnings.
		20m 16s

Subsystem	Report/Notes
Docker	ClientAPI=1.48 ServerAPI=1.48 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-400/2/artifact/out/Dockerfile
GITHUB PR	#400
Optional Tests	dupname asflicense javac javadoc unit spotbugs findbugs checkstyle compile
uname	Linux d5280d15e73a 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	personality/tez.sh
git revision	master / c34ec16
Default Java	Private Build-1.8.0_442-8u442-b06us1-0ubuntu122.04-b06
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu122.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_442-8u442-b06us1-0ubuntu122.04-b06
Test Results	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-400/2/testReport/
Max. process+thread count	249 (vs. ulimit of 5500)
modules	C: tez-dag U: tez-dag
Console output	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-400/2/console
versions	git=2.34.1 maven=3.6.3 findbugs=3.0.1
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[ayushtkn]

LGTM