[DISCUSS][WIP]TEZ-4665: [Cloud] Unmanaged task containers - task container discovery

[Aggarwal-Raghav]

No description provided.

[Aggarwal-Raghav]

With the docker-compose in TEZ-4700, the TezChild#main() constructor is working in ZK mode, now the run() method needs to be worked upon.
Now with this changes TezChild can find the applicationId written by TezAM in zk path /tez-external-sessions/tez_am/server/, In logs the line shows that this change is working

ZK Mode: Discovered AM application_1774893768744_0000 at tez-am:10001

tez-child.log

[tez-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	7m 28s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+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 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	6m 47s		master passed
+1 💚	compile	0m 33s		master passed
+1 💚	checkstyle	0m 35s		master passed
+1 💚	javadoc	0m 31s		master passed
+0 🆗	spotbugs	0m 59s		tez-runtime-internals in master has 111 extant spotbugs warnings.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 20s		the patch passed
+1 💚	codespell	0m 51s		No new issues.
+1 💚	compile	0m 18s		the patch passed
+1 💚	javac	0m 18s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	0m 11s	/results-checkstyle-tez-runtime-internals.txt	tez-runtime-internals: The patch generated 1 new + 7 unchanged - 0 fixed = 8 total (was 7)
+1 💚	javadoc	0m 11s		the patch passed
+1 💚	spotbugs	0m 54s		the patch passed
			_ Other Tests _
+1 💚	unit	0m 51s		tez-runtime-internals in the patch passed.
+1 💚	asflicense	0m 9s		The patch does not generate ASF License warnings.
		21m 53s

Subsystem	Report/Notes
Docker	ClientAPI=1.54 ServerAPI=1.54 base: https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-473/1/artifact/out/Dockerfile
GITHUB PR	#473
Optional Tests	dupname asflicense javac javadoc unit spotbugs checkstyle codespell detsecrets compile
uname	Linux 54480487ad69 5.15.0-164-generic #174-Ubuntu SMP Fri Nov 14 20:25:16 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	/home/jenkins/jenkins-agent/workspace/tez-multibranch_PR-473/src/.yetus/personality.sh
git revision	master / ec55ca4
Default Java	Ubuntu-21.0.10+7-Ubuntu-124.04
Test Results	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-473/1/testReport/
Max. process+thread count	251 (vs. ulimit of 5500)
modules	C: tez-runtime-internals U: tez-runtime-internals
Console output	https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-473/1/console
versions	git=2.43.0 maven=3.8.7 spotbugs=4.9.3 codespell=2.4.1
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