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	0m 43s	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 48s	master passed
+1 💚	compile	0m 13s	master passed
+1 💚	javadoc	0m 7s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 24s	the patch passed
+1 💚	compile	0m 14s	the patch passed
+1 💚	javac	0m 14s	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 6s	the patch passed
		_ Other Tests _
+1 💚	unit	0m 33s	root in the patch passed.
+1 💚	asflicense	0m 6s	The patch does not generate ASF License warnings.
		3m 23s

Subsystem	Report/Notes
Docker	ClientAPI=1.42 ServerAPI=1.42 base: https://ci-hbase.apache.org/job/HBase-Thirdparty-PreCommit/job/PR-100/1/artifact/yetus-precommit-check/output/Dockerfile
GITHUB PR	#100
Optional Tests	dupname asflicense javac javadoc unit xml compile
uname	Linux f99e0087acce 5.4.0-137-generic #154-Ubuntu SMP Thu Jan 5 17:03:22 UTC 2023 x86_64 GNU/Linux
Build tool	maven
git revision	master / d2527ed
Default Java	Oracle Corporation-1.8.0_282-b08
Test Results	https://ci-hbase.apache.org/job/HBase-Thirdparty-PreCommit/job/PR-100/1/testReport/
Max. process+thread count	414 (vs. ulimit of 1000)
modules	C: . U: .
Console output	https://ci-hbase.apache.org/job/HBase-Thirdparty-PreCommit/job/PR-100/1/console
versions	git=2.20.1
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