Config builder enhancements

[amd-keonlee2]

Summary

• Fix where plugin argument default values would be set as default_factory() and downstream methods did not check this
• Fix where dict and list objects would not be populated when generating a config
• Modified test_config_builder.py to catch above case

Test plan

• pytest test/unit
• pytest test/functional (if applicable)
• pre-commit run --all-files

Checklist

• Added/updated tests (or explained why not)
• Updated docs/README if behavior changed
• No secrets or credentials committed

Before

    "KernelModulePlugin": {
      "collection": true,
      "analysis": true,
      "system_interaction_level": "INTERACTIVE",
      "data": null,
      "analysis_args": {
        "kernel_modules": null,
        "regex_filter": null
      }
    },
    "CmdlinePlugin": {
      "collection": true,
      "analysis": true,
      "system_interaction_level": "INTERACTIVE",
      "data": null,
      "analysis_args": {
        "required_cmdline": null,
        "banned_cmdline": null,
        "os_overrides": null,
        "platform_overrides": null
      }
    }

After

    "KernelModulePlugin": {
      "collection": true,
      "analysis": true,
      "system_interaction_level": "INTERACTIVE",
      "data": null,
      "analysis_args": {
        "kernel_modules": {},
        "regex_filter": [
          "amd"
        ]
      }
    },
    "CmdlinePlugin": {
      "collection": true,
      "analysis": true,
      "system_interaction_level": "INTERACTIVE",
      "data": null,
      "analysis_args": {
        "required_cmdline": [],
        "banned_cmdline": [],
        "os_overrides": {},
        "platform_overrides": {}
      }
    }

[alexandraBara]

LGTM