Convert custom Test tasks to modern Test Suites for Gradle 9 compatibility

[Copilot]

With 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.

This PR migrates all custom test tasks to Gradle's modern Test Suites approach, converting 197 test tasks across 100 build files.

Migration Pattern

Before (Broken in Gradle 9):

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

tasks {
  check {
    dependsOn(testStableSemconv)
  }
}

After (Gradle 9+ Compatible):

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"))
  }
}

Changes Made

• Replaced: by registering(Test::class) → by registering(JvmTestSuite::class)
• Wrapped configurations: All test task configurations moved inside targets.all.testTask.configure { }
• Updated dependencies: Changed dependsOn(taskName) → dependsOn(testing.suites.named("taskName"))
• Preserved all existing functionality: JVM args, system properties, filters, includes, etc.

Impact

• ✅ Test suites now execute successfully instead of showing "NO-SOURCE" errors
• ✅ All custom test configurations (stable semconv, experimental features, etc.) preserved
• ✅ Complex test patterns with filters and multiple dependencies maintained
• ✅ Repository is now fully compatible with Gradle 9's modern Test Suite requirements

Files Converted

Affected instrumentation modules include:

• Database clients: alibaba-druid, c3p0, vibur-dbcp, hikaricp, jdbc, etc.
• AWS SDK modules with experimental test suites
• Spring framework modules with custom test configurations
• Elasticsearch, Cassandra, MongoDB and other database clients
• Complex test patterns in external-annotations, integration-tests, etc.

All test functionality remains identical - only the underlying Gradle configuration has been modernized for Gradle 9 compatibility.

Fixes #68.

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