HADOOP-19343: Add hadoop-gcp configuration to core-default.xml and ServiceLoader file.

[cnauroth]

Description of PR

HADOOP-19343: Add hadoop-gcp configuration to core-default.xml and ServiceLoader file.

This is in sync with configuration documentation here:

https://github.com/apache/hadoop/blob/HADOOP-19343/hadoop-tools/hadoop-gcp/src/site/markdown/tools/hadoop-gcp/Configuration.md

How was this patch tested?

I ran all hadoop-gcp integration tests, and they passed. I also built a distro and manually tested a few hadoop fs commands targeting gs:// URIs.

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

[cnauroth]

@steveloughran and @mukund-thakur , respectfully requesting review. Thank you!

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 20s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+0 🆗	xmllint	0m 0s		xmllint 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.
			_ HADOOP-19343 Compile Tests _
+0 🆗	mvndep	9m 38s		Maven dependency ordering for branch
+1 💚	mvninstall	23m 46s		HADOOP-19343 passed
+1 💚	compile	8m 37s		HADOOP-19343 passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	compile	7m 27s		HADOOP-19343 passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	mvnsite	1m 27s		HADOOP-19343 passed
+1 💚	javadoc	1m 14s		HADOOP-19343 passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	1m 5s		HADOOP-19343 passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	shadedclient	74m 15s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 20s		Maven dependency ordering for patch
+1 💚	mvninstall	7m 56s		the patch passed
+1 💚	compile	8m 58s		the patch passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javac	8m 58s		the patch passed
+1 💚	compile	7m 58s		the patch passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	javac	7m 58s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	1m 13s		the patch passed
+1 💚	javadoc	1m 1s		the patch passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 51s		the patch passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	shadedclient	27m 22s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	18m 34s	/patch-unit-hadoop-common-project_hadoop-common.txt	hadoop-common in the patch passed.
+1 💚	unit	0m 24s		hadoop-gcp in the patch passed.
+1 💚	asflicense	0m 36s		The patch does not generate ASF License warnings.
		147m 58s

Reason	Tests
Failed junit tests	hadoop.conf.TestCommonConfigurationFields

Subsystem	Report/Notes
Docker	ClientAPI=1.51 ServerAPI=1.51 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7916/1/artifact/out/Dockerfile
GITHUB PR	#7916
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient codespell detsecrets xmllint
uname	Linux 6b78e7eefdd2 5.15.0-143-generic #153-Ubuntu SMP Fri Jun 13 19:10:45 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	HADOOP-19343 / ae9bba2
Default Java	Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7916/1/testReport/
Max. process+thread count	3149 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common hadoop-tools/hadoop-gcp U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7916/1/console
versions	git=2.25.1 maven=3.6.3
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[slfan1989]

@cnauroth From my side, +1, but we need to fix the TestCommonConfigurationFields unit test.

[cnauroth]

I committed this to the feature branch with the test fix. Thank you, @slfan1989 .

[steveloughran]

@cnauroth given this is in, can you cut
hadoop-tools/hadoop-gcp/src/main/resources/META-INF/services/org.apache.hadoop.fs.FileSystem

thanks