This PR migrates custom Test tasks registered with by registering(Test::class) to modern Test Suites using by registering(JvmTestSuite::class) to ensure compatibility with Gradle 9.

Problem

After upgrading to Gradle 9, custom Test tasks registered with by registering(Test::class) are being marked as "NO-SOURCE" and failing to execute tests. This is due to Gradle 9's new requirement that Test tasks must have explicit test source configuration.

Solution

Instead of applying workarounds to custom Test tasks, this PR migrates to Gradle's modern Test Suites approach. The migration converts:

Before:

val testStableSemconv by registering(Test::class) {
  jvmArgs("-Dotel.semconv-stability.opt-in=database")
  systemProperty("collectMetadata", collectMetadata)
}

tasks {
  check {
    dependsOn(testStableSemconv)
  }
}

After:

testing {
  suites {
    val testStableSemconv by registering(JvmTestSuite::class) {
      targets {
        all {
          testTask.configure {
            jvmArgs("-Dotel.semconv-stability.opt-in=database")
            systemProperty("collectMetadata", collectMetadata)
          }
        }
      }
    }
  }
}

tasks {
  check {
    dependsOn(testing.suites.named("testStableSemconv"))
  }
}

Files Converted

This PR converts 39 build files (41% of the total 95 files that need conversion):

• Database Modules: alibaba-druid, apache-dbcp, c3p0, geode, hikaricp, vibur-dbcp, r2dbc, spymemcached, cassandra, couchbase, mongo, lettuce
• Infrastructure Modules: netty, clickhouse, influxdb, guava, elasticsearch, AWS SDK, JMS
• Complex Cases: Files with existing testing blocks, multiple test tasks, and advanced configurations
• Module Types: Both javaagent and library modules

Complex Cases Handled

Successfully migrated complex scenarios including:

• Files with existing testing blocks (spring-boot-autoconfigure, influxdb-2.4, jms-1.1)
• Multiple test tasks per file (guava-10.0, elasticsearch, aws-sdk-2.2)
• Advanced configurations with filters, system properties, and JVM arguments
• Mixed javaagent and library module patterns

Verification

All converted files have been validated:

• ✅ Syntax validation passes
• ✅ Test tasks are available and properly configured
• ✅ No "NO-SOURCE" errors in dry runs
• ✅ Dependencies correctly reference test suites

Remaining Work

This establishes the working migration pattern with 41% completion. The remaining 56 files can be converted using the same approach, with some requiring individual attention for complex existing testing blocks or non-standard test patterns.

Addressing #68.

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