fix: Translate stackscript_data to kwargs during disk creation

[lgarber-akamai]

📝 Description

This change resolves a bug that prevented stackscript_data from being properly embedded in instance module disk creation requests.

This is necessary because linode_api4 expects StackScript data to be specified as kwargs during disk creation: https://github.com/linode/linode_api4-python/blob/dev/linode_api4/objects/linode.py#L1161

✔️ How to Test

The following test steps assume you have pulled down this PR locally.

Integration Testing

make test TEST_ARGS="-v instance_disk_stackscript"

Manual Testing

1. In an Ansible Collection sandbox environment (e.g. dx-devenv), run the following playbook:

- name: Create Linode Instance
  hosts: localhost
  tasks:
    - linode.cloud.stackscript:
        label: "test-stackscript"
        images:
          - "linode/alpine3.19"
        script: |
          #!/bin/ash
          # <UDF name="package" label="System Package to Install" example="nginx">
          apk add $PACKAGE
        state: present
      register: stackscript_create

    - linode.cloud.instance:
        label: "test-instance"
        region: us-mia
        type: g6-nanode-1
        booted: false
        disks:
          - label: test-disk
            size: 1024
            image: linode/alpine3.19
            stackscript_id: "{{ stackscript_create.stackscript.id }}"
            stackscript_data:
              package: cowsay
        state: present
      register: instance_create

    - linode.cloud.stackscript_info:
        label: "{{ stackscript_create.stackscript.label }}"
      register: stackscript_info

    - debug:
        var: stackscript_info.stackscript.deployments_active

2. Ensure the debug output contains the following, implying the StackScript was successfully deployed to the disk:

ok: [localhost] => {
    "stackscript_info.stackscript.deployments_active": 1
}

📷 Preview

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[zliang-akamai]

Nice work! Tested and worked well.

[ykim-akamai]

LG, Tested locally