HDFS-17513. Fix reconfigure slow peer enable for Namenode.

[huangzhaobo99]

Description of PR

Reconfigure slow peer parameters did not take effect in the BlockPlacementPolicyDefault class.

How was this patch tested?

Add UT

[huangzhaobo99]

@haiyang1987 Please take a look at this PR when you have time. If there are any configuration changes, NN may not be able to avoid slow nodes. Thanks.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
			_ Prechecks _
+1 💚	dupname	0m 01s		No case conflicting files found.
+0 🆗	spotbugs	0m 00s		spotbugs executables are not available.
+0 🆗	codespell	0m 00s		codespell was not available.
+0 🆗	detsecrets	0m 00s		detect-secrets was not available.
+1 💚	@author	0m 01s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 00s		The patch appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	92m 22s		trunk passed
+1 💚	compile	6m 22s		trunk passed
+1 💚	checkstyle	5m 05s		trunk passed
+1 💚	mvnsite	7m 00s		trunk passed
+1 💚	javadoc	6m 23s		trunk passed
+1 💚	shadedclient	153m 08s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	5m 13s		the patch passed
+1 💚	compile	3m 43s		the patch passed
+1 💚	javac	3m 43s		the patch passed
+1 💚	blanks	0m 00s		The patch has no blanks issues.
+1 💚	checkstyle	2m 42s		the patch passed
+1 💚	mvnsite	4m 36s		the patch passed
+1 💚	javadoc	3m 43s		the patch passed
+1 💚	shadedclient	167m 00s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	5m 41s		The patch does not generate ASF License warnings.
		441m 09s

Subsystem	Report/Notes
GITHUB PR	#6802
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	MINGW64_NT-10.0-17763 b213c3ff39ba 3.4.10-87d57229.x86_64 2024-02-14 20:17 UTC x86_64 Msys
Build tool	maven
Personality	/c/hadoop/dev-support/bin/hadoop.sh
git revision	trunk / 017d97f
Default Java	Azul Systems, Inc.-1.8.0_332-b09
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch-windows-10/job/PR-6802/1/testReport/
modules	C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch-windows-10/job/PR-6802/1/console
versions	git=2.45.0.windows.1
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