Fix bean introspection for Kotlin extension methods

[yawkat]

Summary

• model Kotlin extension receivers as method parameters in KotlinMethodElement
• use the same parameter view when generating bean method metadata for introspections
• add a regression test for invoking an @Executable Kotlin extension method through BeanIntrospection

Problem

BeanIntrospection bean methods for Kotlin extension functions were generated without the extension receiver in the method signature. That made invocations like addOne.invoke(bean, 1) resolve to a zero-argument JVM method and fail with NoSuchMethodError.

Verification

• ran :micronaut-inject-kotlin:test --tests 'io.micronaut.kotlin.processing.visitor.BeanIntrospectionSpec.test generate bean method for kotlin extension function'
• verified the targeted regression passes under Java 25 (JAVA_HOME=/usr/lib/jvm/java-25-openjdk)

Resolves #10669

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud