Fix GraalVM Dockerfile generation issues

[anuruddhal]

Purpose

• Resolve GraalVM native image Java 21 warnings with experimental options ballerina-library#7252
• ERROR failed to load the required native library ballerina-library#7706

[Copilot]

Pull Request Overview

This PR addresses GraalVM Dockerfile generation issues by updating the native-image command flags and base images used in both the plugin code and its tests.

• Replaces the deprecated "-H:Name=" flag with the new "-o" flag in Docker command constructions.
• Updates Docker base image references from "gcr.io/distroless/base" to "gcr.io/distroless/cc".
• Adjusts test assertions to reflect the updated Docker command and image references.

Reviewed Changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
compiler-plugin/src/main/java/io/ballerina/c2c/utils/KubernetesUtils.java	Updated Docker command builder from "-H:Name=" to "-o".
compiler-plugin-tests/src/test/java/io/ballerina/c2c/test/docker/DockerGeneratorTests.java	Modified test assertions to check for the updated command flag and base image.
compiler-plugin/src/main/java/io/ballerina/c2c/DockerGenConstants.java	Changed runtime base image constant to "gcr.io/distroless/cc".
compiler-plugin-tests/src/test/java/io/ballerina/c2c/test/samples/NativeTest.java	Changed container/port retrieval to use "getFirst()" and updated command string check.
compiler-plugin-tests/src/test/java/io/ballerina/c2c/test/samples/NativeJobTest.java	Updated Docker command and base image assertions to use new references.
compiler-plugin-tests/src/test/java/io/ballerina/c2c/test/samples/NativeImplicitArgsTest.java	Updated Docker build command to use "-o" flag instead of "-H:Name=".
compiler-plugin-tests/src/test/java/io/ballerina/c2c/test/samples/NativeBaseTest.java	Revised Dockerfile assertions to match updated base image and command format.
examples/graalvm-custom-builder/Cloud.toml	Updated custom builder command to use "-o" flag as well.
compiler-plugin-tests/src/test/java/io/ballerina/c2c/test/samples/NativeBuilderConfigTest.java	Altered assertions for Docker command and runtime image in builder config tests.
compiler-plugin-tests/src/test/java/io/ballerina/c2c/test/samples/NativeArgsTest.java	Adjusted Docker command tests to check for the new flag format.

Files not reviewed (1)

• docker-images/native-builder/build-native.sh: Language not supported