HBASE-27808 Change flatten mode for oss in our pom file

[ndimiduk]

No description provided.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	2m 41s	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.
-0 ⚠️	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	0m 46s	master passed
+1 💚	compile	0m 11s	master passed
+1 💚	javadoc	0m 8s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 18s	the patch passed
+1 💚	compile	0m 11s	the patch passed
+1 💚	javac	0m 11s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	xml	0m 1s	The patch has no ill-formed XML file.
+1 💚	javadoc	0m 5s	the patch passed
		_ Other Tests _
+1 💚	unit	7m 17s	root in the patch passed.
+1 💚	asflicense	0m 7s	The patch does not generate ASF License warnings.
		11m 58s

Subsystem	Report/Notes
Docker	ClientAPI=1.42 ServerAPI=1.42 base: https://ci-hbase.apache.org/job/HBase-Operator-Tools-PreCommit/job/PR-116/1/artifact/yetus-precommit-check/output/Dockerfile
GITHUB PR	#116
Optional Tests	dupname asflicense javac javadoc unit xml compile
uname	Linux 9a5245055915 5.4.0-144-generic #161-Ubuntu SMP Fri Feb 3 14:49:04 UTC 2023 x86_64 GNU/Linux
Build tool	maven
git revision	master / 4319d8a
Default Java	Oracle Corporation-1.8.0_342-b07
Test Results	https://ci-hbase.apache.org/job/HBase-Operator-Tools-PreCommit/job/PR-116/1/testReport/
Max. process+thread count	1250 (vs. ulimit of 5000)
modules	C: . U: .
Console output	https://ci-hbase.apache.org/job/HBase-Operator-Tools-PreCommit/job/PR-116/1/console
versions	git=2.30.2 maven=3.8.6
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