[GR-58214] Respect order of arguments for explict main class and image name.

[graalvmbot]

This PR fixes a long standing bug in the native-image driver. native-image allows positional arguments for specifying the main class name and the image name. Previously those positional arguments always won even if a later option states something else for class name or image name.

E.g.

native-image -cp hello.jar MyAppHello hello -o hello-image

Previously the built image would be named hello and the -o hello-image would not been able to change that even though it comes after the hello positional argument.
Now this is fixed and the image would be named hello-image as it should be.

This bug was especially annoying in the context of native-image bundles. E.g. If a bundle gets created with e.g.

native-image --bundle-create -jar foobar.jar foobar

it was impossible to rebuild that bundle and have it build the image with custom name. I.e.

native-image --bundle-apply=foobar.nib -Os -o foobar_optimized

would still have produced an image named foobar. Now with this fixed it produces an image named foobar_optimized.