fix: Always load object values when converting MappedObjects to dict - #400

📝 Description

This change resolves an issue that would cause unloaded objects to be serialized as None when converting a MappedObject to a dict. This works by explicitly refreshing the object if it has not already been populated.

Additionally, this change fixes a small bug that prevented parent IDs from being accessed in _populate(...) overrides.

This has been cross-tested against the Ansible instance_config_disk test with some minor changes in Ansible and everything passes as expected.

Blocks linode/ansible_linode#495

✔️ How to Test

Unit Testing

make testunit

Manual Testing

1. In a linode_api4 sandbox environment (e.g. dx-devenv), run the following:

import os

from linode_api4 import LinodeClient, EventPoller

client = LinodeClient(os.getenv("LINODE_TOKEN"))

poller = EventPoller(
    client,
    entity_type="linode",
    action="linode_create",
)

inst = client.linode.instance_create(
    "g6-nanode-1",
    "us-mia",
    image="linode/alpine3.19",
    root_pass="c00lr00tp4ssw0rd!!!!!1!!!"
)

poller.set_entity_id(inst.id)
poller.wait_for_next_event_finished()

print(inst.configs[0].devices.dict["sda"])

2. Ensure the output looks similar to the following:

{'id': 113268590, 'status': 'ready', 'label': 'Alpine 3.19 Disk', 'created': '2024-04-18T17:11:55', 'updated': '2024-04-18T17:12:12', 'filesystem': 'ext4', 'size': 25088}

This confirms the devices have been explicitly refreshed during the dict conversion.