Fix reusing config accross TaskGroups/DAGs

[tatiana]

If execution_config was reused, Cosmos 1.2.2 would raise:

astronomer-cosmos/dags/basic_cosmos_task_group.py
Traceback (most recent call last):
  File "/Users/tati/Code/cosmos-clean/astronomer-cosmos/venv-38/lib/python3.8/site-packages/airflow/models/dagbag.py", line 343, in parse
    loader.exec_module(new_module)
  File "<frozen importlib._bootstrap_external>", line 848, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/Users/tati/Code/cosmos-clean/astronomer-cosmos/dags/basic_cosmos_task_group.py", line 74, in <module>
    basic_cosmos_task_group()
  File "/Users/tati/Code/cosmos-clean/astronomer-cosmos/venv-38/lib/python3.8/site-packages/airflow/models/dag.py", line 3817, in factory
    f(**f_kwargs)
  File "/Users/tati/Code/cosmos-clean/astronomer-cosmos/dags/basic_cosmos_task_group.py", line 54, in basic_cosmos_task_group
    orders = DbtTaskGroup(
  File "/Users/tati/Code/cosmos-clean/astronomer-cosmos/cosmos/airflow/task_group.py", line 26, in __init__
    DbtToAirflowConverter.__init__(self, *args, **specific_kwargs(**kwargs))
  File "/Users/tati/Code/cosmos-clean/astronomer-cosmos/cosmos/converter.py", line 113, in __init__
    raise CosmosValueError(
cosmos.exceptions.CosmosValueError: ProjectConfig.dbt_project_path is mutually exclusive with RenderConfig.dbt_project_path and ExecutionConfig.dbt_project_path.If using RenderConfig.dbt_project_path or ExecutionConfig.dbt_project_path, ProjectConfig.dbt_project_path should be None

This has been raised by an Astro customer and our field engineer, who tried to run:
https:/astronomer/cosmos-demo

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9cd46d2) 92.67% compared to head (6091a3b) 92.68%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #664   +/-   ##
=======================================
  Coverage   92.67%   92.68%           
=======================================
  Files          54       54           
  Lines        2212     2215    +3     
=======================================
+ Hits         2050     2053    +3     
  Misses        162      162           

Files	Coverage Δ
cosmos/converter.py	97.01% <100.00%> (+0.13%)	⬆️

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