AbstractMicronautAotCliMojo fails when Maven and OS java.exe are different

[rfscholte]

To reproduce verify if mvn -v and java -version are different (ideally the latter is Java "old", like 11).

This can already be confirmed with the following ITs
[ERROR] The following builds failed:
[ERROR] * aot-sample\pom.xml
[ERROR] * issue375\pom.xml
[ERROR] * package-jar-aot\pom.xml
[ERROR] * run-aot-jvmargs\pom.xml
[ERROR] * run-aot\pom.xml

Root cause is the AbstractMicronautAotCli. This class doesn't execute java directly, but delegates it to the exec-maven-plugin. However, this one just calls "java".

    String javaExecutable = MojoUtils.findJavaExecutable(toolchainManager, mavenSession);

    return configuration(
        element("executable", javaExecutable),
        element("arguments", runnerArgs)
    );

By injecting the ToolchainManager and MavenSession and replacing this small piece of code it'll work as expected