Rename and refactor User#confirm! to User#mark_email_as_confirmed!

[ClearlyClaire]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (e81c5c0) 84.84% compared to head (8700aeb) 84.85%.
Report is 5 commits behind head on main.

Files	Patch %	Lines
app/models/concerns/user/omniauthable.rb	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #28735      +/-   ##
==========================================
+ Coverage   84.84%   84.85%   +0.01%     
==========================================
  Files        1038     1038              
  Lines       28152    28152              
  Branches     4534     4529       -5     
==========================================
+ Hits        23886    23889       +3     
  Misses       3103     3103              
+ Partials     1163     1160       -3     

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