Implement Preprocess DAG following recent architecture updates [Duplicate]

[tskir]

Just repeating #216 which I accidentally merged into the wrong branch -__-

[codecov-commenter]

Codecov Report

Merging #225 (ca459e0) into main (2014e48) will increase coverage by 0.10%.
Report is 14 commits behind head on main.
The diff coverage is 86.84%.

@@            Coverage Diff             @@
##             main     #225      +/-   ##
==========================================
+ Coverage   85.53%   85.64%   +0.10%     
==========================================
  Files          80       81       +1     
  Lines        1839     1853      +14     
==========================================
+ Hits         1573     1587      +14     
  Misses        266      266              

Files	Coverage Δ
src/airflow/dags/common_airflow.py	100.00% <100.00%> (ø)
src/airflow/dags/dag_genetics_etl.py	100.00% <100.00%> (ø)
src/airflow/dags/dag_preprocess.py	100.00% <100.00%> (ø)
src/otg/datasource/finngen/__init__.py	100.00% <ø> (ø)
src/otg/datasource/finngen/summary_stats.py	100.00% <100.00%> (ø)
src/otg/finngen.py	65.38% <0.00%> (ø)