feat: extract config for finngen ingestion to yaml file

[project-defiant]

Context

Move all configuration of the finngen_ingestion dag to the separate config.
This dag will has it's own lifecycle depending on the finngen data releases, so it's a good idea to have it run on demand only when requred and cache the produced results:

• finngen credible sets (ingested by gentropy StudyLocus class)
• finngen study index (ingested by gentropy StudyIndex class)
  inside the staging gcs path gs://finngen_data/ with appropriate release prefix (r11)

Implementations

• extracted constants from the finngen_ingestion.py to finngen_ingestion.yaml config file.
• Explicitly declared parameters that were used as default in gentropy finngen steps.
• Renamed dag

[project-defiant]

@javfg ready for 🥊 2

[javfg]

All good this time around!