bug: User_dict entries not read into parser configs

[ktehranchi]

Describe the bug
Recent changes made (compared to branch kt/fix_scenario_filtering) have caused the dictionaries from the user_dict.yaml to not be read into the parser config. This causes the plexos parser to fail with error:

r2x run -i NVE_7_19_24/ --input-model plexos --output-model sienna --user-dict user_dict_nve_july.yaml --year=2030 --weather-year=2030 -o output_test2  --flags plexos-csv=1
Traceback (most recent call last):
  File "/Users/kamrantehranchi/miniforge3/envs/r2x/bin/r2x", line 8, in <module>
    sys.exit(cli())
             ^^^^^
  File "/Users/kamrantehranchi/Local_Documents/R2X/src/r2x/cli.py", line 42, in cli
    cli_commands(cli_args, user_dict)
  File "/Users/kamrantehranchi/Local_Documents/R2X/src/r2x/cli.py", line 63, in cli_commands
    run(cli_args, user_dict=user_dict)
  File "/Users/kamrantehranchi/Local_Documents/R2X/src/r2x/runner.py", line 161, in run
    run_single_scenario(scenario)
  File "/Users/kamrantehranchi/Local_Documents/R2X/src/r2x/runner.py", line 114, in run_single_scenario
    system, parser = run_parser(scenario, **kwargs)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/kamrantehranchi/Local_Documents/R2X/src/r2x/runner.py", line 59, in run_parser
    parser = get_parser_data(config, parser_class, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/kamrantehranchi/Local_Documents/R2X/src/r2x/parser/handler.py", line 278, in get_parser_data
    parser = parser_class(config=config, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/kamrantehranchi/Local_Documents/R2X/src/r2x/parser/plexos.py", line 175, in __init__
    raise ParserError(msg)
r2x.exceptions.ParserError: At least one of fuel_map, or device_map, or device_match_string, or category_map is required to initialize PlexosParser

pdb'ing into the config shows that the plexos_fuel_map and other user dict specifications are not being read into self.config.defaults

Not sure if if this is a change to the CLI/user_dict specifications, but I couldn't find a change in the code which would indicate this.

To Reproduce
See r2x command above. The same command works on my kt/fix_scenario_filtering branch. (minus the new "run" command)

Environement (please complete the following information):

• OS: Mac
• R2X version: main

[pesap]

This should be fixed in the latest version. Let me know if still appears and we can re-open