Change test_behavior and execution_mode to use Enum as opposed to Literals

[tatiana]

Change DbtDag and DbtTaskGroup so they use Enum as opposed to Literal strings to represent the arguments:

• test_behavior
• execution_mode

This is a breaking change. Before:

DbtDag(..., execution_mode="kubernetes", test_behavior="after_all")

Now:

from cosmos import ExecutionMode, TestBehavior

DbtDag(..., execution_mode=ExecutionMode.kubernetes, test_behavior=TestBehavior.AFTER_ALL)

Closes #371

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.28 🎉

Comparison is base (f52293e) 90.70% compared to head (a4c350e) 90.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #379      +/-   ##
==========================================
+ Coverage   90.70%   90.98%   +0.28%     
==========================================
  Files          44       45       +1     
  Lines        1484     1542      +58     
==========================================
+ Hits         1346     1403      +57     
- Misses        138      139       +1     

Impacted Files	Coverage Δ
cosmos/__init__.py	100.00% <100.00%> (ø)
cosmos/airflow/graph.py	100.00% <100.00%> (ø)
cosmos/constants.py	100.00% <100.00%> (ø)
cosmos/converter.py	100.00% <100.00%> (ø)
cosmos/dbt/graph.py	100.00% <100.00%> (ø)
cosmos/dbt/parser/project.py	88.73% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[jlaneve]

only comment here is to see if we can convert strings to enums in/before the converter so this isn't a breaking change. all current code looks good though!

[jlaneve]

pre-emptively approving once the comment about converting strings to enums is addressed

[tatiana]

Thanks, @jlaneve , I'll address it!