Simplify generate_epiweekly

[dylanhmorris]

• use id_cols argument to forecasttools::daily_to_epiweekly, which avoids need for a group_modify() call

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 17.08%. Comparing base (f275238) to head (b49d0b4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #259   +/-   ##
=======================================
  Coverage   17.08%   17.08%           
=======================================
  Files          21       21           
  Lines        1346     1346           
=======================================
  Hits          230      230           
  Misses       1116     1116           

Flag	Coverage Δ
hewr	48.79% <ø> (ø)
pipelines	0.00% <ø> (ø)
pyrenew_hew	1.91% <ø> (ø)

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