fix(build): fix Gradle 9.5 cross-project sourceSets access

[fdelbrayelle]

Summary

• Gradle 9.5 no longer allows accessing .sourceSets on a project() call inside a dependencies {} block — it returns DefaultProjectDependency, not Project
• All 6 consumer submodules used project(':plugin-debezium').sourceSets.test.output, which breaks with Gradle 9.5
• Fix: expose plugin-debezium test classes as a testJar artifact under a named testOutput configuration; all consumers now reference it via project(path: ':plugin-debezium', configuration: 'testOutput')

Test plan

• CI passes on this PR

🤖 Generated with Claude Code

[github-actions]

📦 Artifacts

Name	Size	Updated	Expiration
	256.38 MB	May 7, 26, 9:00:36 AM UTC	May 14, 26, 9:00:26 AM UTC

🛡 Trivy

Vulnerability in: Java

Vulnerability	Severity	Package	Installed Version	Fixed Version
CVE-2025-59250	HIGH	com.microsoft.sqlserver:mssql-jdbc	12.10.1	10.2.4.jre11, 11.2.4.jre11, 12.2.1.jre11, 12.6.5.jre11, 12.8.2.jre11, 12.10.2.jre11, 13.2.1.jre11
CVE-2026-42579	HIGH	io.netty:netty-codec-dns	4.2.12.Final	4.2.13.Final, 4.1.133.Final
CVE-2026-42577	HIGH	io.netty:netty-transport-native-epoll	4.2.12.Final	4.2.13.Final
CVE-2025-67030	HIGH	org.codehaus.plexus:plexus-utils	3.0.24	4.0.3, 3.6.1
CVE-2025-67030	HIGH	org.codehaus.plexus:plexus-utils	3.0.24	4.0.3, 3.6.1
CVE-2025-67030	HIGH	org.codehaus.plexus:plexus-utils	3.0.24	4.0.3, 3.6.1
CVE-2025-67030	HIGH	org.codehaus.plexus:plexus-utils	3.0.24	4.0.3, 3.6.1
CVE-2025-67030	HIGH	org.codehaus.plexus:plexus-utils	3.0.24	4.0.3, 3.6.1
CVE-2025-67030	HIGH	org.codehaus.plexus:plexus-utils	3.0.24	4.0.3, 3.6.1
CVE-2026-2332	HIGH	org.eclipse.jetty:jetty-http	12.0.31	12.1.7, 12.0.33, 11.0.28, 10.0.28, 9.4.60
CVE-2026-2332	HIGH	org.eclipse.jetty:jetty-http	12.0.31	12.1.7, 12.0.33, 11.0.28, 10.0.28, 9.4.60
CVE-2026-2332	HIGH	org.eclipse.jetty:jetty-http	12.0.31	12.1.7, 12.0.33, 11.0.28, 10.0.28, 9.4.60
CVE-2026-2332	HIGH	org.eclipse.jetty:jetty-http	12.0.31	12.1.7, 12.0.33, 11.0.28, 10.0.28, 9.4.60
CVE-2026-2332	HIGH	org.eclipse.jetty:jetty-http	12.0.31	12.1.7, 12.0.33, 11.0.28, 10.0.28, 9.4.60
CVE-2026-2332	HIGH	org.eclipse.jetty:jetty-http	12.0.31	12.1.7, 12.0.33, 11.0.28, 10.0.28, 9.4.60
CVE-2026-1605	HIGH	org.eclipse.jetty:jetty-server	12.0.31	12.1.6, 12.0.32
CVE-2026-1605	HIGH	org.eclipse.jetty:jetty-server	12.0.31	12.1.6, 12.0.32
CVE-2026-1605	HIGH	org.eclipse.jetty:jetty-server	12.0.31	12.1.6, 12.0.32
CVE-2026-1605	HIGH	org.eclipse.jetty:jetty-server	12.0.31	12.1.6, 12.0.32
CVE-2026-1605	HIGH	org.eclipse.jetty:jetty-server	12.0.31	12.1.6, 12.0.32
CVE-2026-1605	HIGH	org.eclipse.jetty:jetty-server	12.0.31	12.1.6, 12.0.32

🧪 Java Unit Tests

	Tests	Passed ✅	Skipped ⚠️	Failed	Time ⏱
Java Tests Report	46 ran	38 ✅	8 ⚠️	0 ❌	3m 23s 831ms

🔁 Unreleased Commits

✅ No unreleased commits found.

[github-actions]

Tests report quick summary:

success ✅ > tests: 46, success: 38, skipped: 8, failed: 0

unfold for details

Project	Status	Success	Skipped	Failed
plugin-debezium	success ✅	28	0	0
plugin-debezium-db2	success ✅	3	0	0
plugin-debezium-mongodb	success ✅	3	0	0
plugin-debezium-mysql	success ✅	3	0	0
plugin-debezium-oracle	success ✅	3	0	0
plugin-debezium-postgres	success ✅	3	0	0
plugin-debezium-sqlserver	success ✅	3	0	0