source.generate.finalModifiers should not add final modifiers to the fields

If I have a field line that:

class User {
    @Parameter(names = { "--age", "-a" }, required = true, description = "User age")
    public int age = 1;
}

following option:

    "[java]": {
        "editor.codeActionsOnSave": {
            "source.generate.finalModifiers": true
        }
    }

add final modifier to it:

class User {
    @Parameter(names = { "--age", "-a" }, required = true, description = "User age")
    public final int age = 1;
}

but it should not, because it can be changes from other code or library like JCommander.

Environment

• Operating System: macOS Sonoma 14.0
• JDK version: Zulu 8.72.0.17-CA-macos-aarch64
• Visual Studio Code version: 1.82.2
• Java extension version: 0.25.14

Start by locating the implementation and tests for source.generate.finalModifiers in the vscode-java codebase. Reproduce the behavior with an annotated, mutable Java field like the issue's User.age example, then add regression coverage showing that the setting does not add final when the field may be changed externally.