fixing deprecated _fields_

[alexandraBara]

Fixed warning for deprecation on fields and inheritance issue that allows plugin.COLLECTION_ARGS to be None from inheritance.
Sample failure:

(venv) (base) [alexbara@TheraS02 node-scraper]$ node-scraper --plugin-config reference_config_globals2.py
  2025-07-31 09:02:41 CDT       INFO               nodescraper | Log path: ./scraper_logs_theras02_thera_amd_com_2025_07_31-09_02_41_AM
  2025-07-31 09:02:41 CDT       INFO               nodescraper | System Name: TheraS02.thera.amd.com
  2025-07-31 09:02:41 CDT       INFO               nodescraper | System SKU: None
  2025-07-31 09:02:41 CDT       INFO               nodescraper | System Platform: None
  2025-07-31 09:02:41 CDT       INFO               nodescraper | System location: SystemLocation.LOCAL
  2025-07-31 09:02:41 CDT       INFO               nodescraper | Initializing connection manager for InBandConnectionManager with default args
  2025-07-31 09:02:41 CDT      ERROR               nodescraper | Unexpected exception when running plugin DimmPlugin: 'NoneType' object has no attribute '__fields__'
Traceback (most recent call last):
  File "/home/alexbara/node-scraper/nodescraper/pluginexecutor.py", line 175, in run_queue
    global_run_args = self.apply_global_args_to_plugin(
  File "/home/alexbara/node-scraper/nodescraper/pluginexecutor.py", line 255, in apply_global_args_to_plugin
    plugin_fields = set(plugin_class.ANALYZER_ARGS.__fields__.keys())
AttributeError: 'NoneType' object has no attribute '__fields__'
  2025-07-31 09:02:41 CDT      ERROR               nodescraper | Unexpected exception when running plugin StoragePlugin: 'NoneType' object has no attribute '__fields__'
Traceback (most recent call last):
  File "/home/alexbara/node-scraper/nodescraper/pluginexecutor.py", line 175, in run_queue
    global_run_args = self.apply_global_args_to_plugin(
  File "/home/alexbara/node-scraper/nodescraper/pluginexecutor.py", line 255, in apply_global_args_to_plugin
    plugin_fields = set(plugin_class.ANALYZER_ARGS.__fields__.keys())
AttributeError: 'NoneType' object has no attribute '__fields__'
  2025-07-31 09:02:41 CDT      ERROR               nodescraper | Unexpected exception when running plugin DmesgPlugin: 'NoneType' object has no attribute '__fields__'
Traceback (most recent call last):
  File "/home/alexbara/node-scraper/nodescraper/pluginexecutor.py", line 175, in run_queue
    global_run_args = self.apply_global_args_to_plugin(
  File "/home/alexbara/node-scraper/nodescraper/pluginexecutor.py", line 255, in apply_global_args_to_plugin
    plugin_fields = set(plugin_class.ANALYZER_ARGS.__fields__.keys())
AttributeError: 'NoneType' object has no attribute '__fields__'
  2025-07-31 09:02:41 CDT       INFO               nodescraper | Closing connections
  2025-07-31 09:02:41 CDT       INFO               nodescraper | Running result collators
  2025-07-31 09:02:41 CDT       INFO               nodescraper | Running TableSummary result collator
  2025-07-31 09:02:41 CDT       INFO               nodescraper |

+-------------------------+--------+---------+
|  Connection              | Status | Message |
+-------------------------+--------+---------+
|  InBandConnectionManager | UNSET  |         |
+-------------------------+--------+---------+

  2025-07-31 09:02:41 CDT       INFO               nodescraper | Data written to csv file: ./scraper_logs_theras02_thera_amd_com_2025_07_31-09_02_41_AM/nodescraper.csv

Config file:

(venv) (base) [alexbara@TheraC60 node-scraper]$ cat reference_config_globals2.py
{
  "global_args": {
      "analysis_args": {
        "exp_bios_version": [
          "M17"
        ],
        "regex_match": false
      },
      "collection_args": {
        "skip_sudo" : 0
      },
      "max_event_priority_level" : 1,
      "system_interaction_level" : 1,
      "preserve_connection" : 1,
      "collection" : 1,
      "analysis" : 0
  },
  "plugins": {
    "DimmPlugin": {},
    "StoragePlugin": {},
    "DmesgPlugin": {}
  },
  "result_collators": {}
}