set structure() as an undesirable function by default

[MichaelChirico]

Follow-up to #2227

[codecov-commenter]

Codecov Report

Merging #2228 (0259566) into main (9c49c6e) will increase coverage by 0.00%.
Report is 2 commits behind head on main.
The diff coverage is 100.00%.

❗ Current head 0259566 differs from pull request most recent head 120a3c3. Consider uploading reports for the commit 120a3c3 to get more accurate results

@@           Coverage Diff           @@
##             main    #2228   +/-   ##
=======================================
  Coverage   99.65%   99.65%           
=======================================
  Files         114      114           
  Lines        5173     5175    +2     
=======================================
+ Hits         5155     5157    +2     
  Misses         18       18           

Files	Coverage Δ
R/utils.R	99.13% <100.00%> (+0.01%)	⬆️
R/zzz.R	100.00% <ø> (ø)

[AshesITR]

For the "by default" part, you need to add it to default_undesirable_functions as well 😉

[AshesITR]

LGTM holding off merging until NEWS is up to speed so we can't forget the bullet.