Fully deprecate frollapply(x=, n=)

[MichaelChirico]

Cycling the deprecation begun in 1.18.0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.97%. Comparing base (45f8a12) to head (4106690).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7530      +/-   ##
==========================================
- Coverage   98.97%   98.97%   -0.01%     
==========================================
  Files          87       87              
  Lines       16734    16732       -2     
==========================================
- Hits        16562    16560       -2     
  Misses        172      172              

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[github-actions]

No obvious timing issues in HEAD=frollapply-deprec

Generated via commit 63c65c4

Download link for the artifact containing the test results: ↓ atime-results.zip

Task	Duration
R setup and installing dependencies	5 minutes and 2 seconds
Installing different package versions	11 minutes and 2 seconds
Running and plotting the test cases	4 minutes and 5 seconds