Replaces .count and .length with .size in tag model

[sangu09]

Fixes #8205

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[gitpod-io]

[codecov]

Codecov Report

Merging #8435 into main will decrease coverage by 4.51%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #8435      +/-   ##
==========================================
- Coverage   81.87%   77.36%   -4.52%     
==========================================
  Files         101      101              
  Lines        5899     6004     +105     
==========================================
- Hits         4830     4645     -185     
- Misses       1069     1359     +290     

Impacted Files	Coverage Δ
app/models/tag.rb	97.51% <100.00%> (ø)
app/controllers/openid_controller.rb	0.00% <0.00%> (-53.90%)	⬇️
app/controllers/comment_controller.rb	72.82% <0.00%> (-14.14%)	⬇️
app/controllers/users_controller.rb	69.62% <0.00%> (-11.49%)	⬇️
app/controllers/application_controller.rb	84.34% <0.00%> (-7.83%)	⬇️
app/models/comment.rb	69.79% <0.00%> (-7.72%)	⬇️
app/controllers/home_controller.rb	91.93% <0.00%> (-6.46%)	⬇️
app/controllers/admin_controller.rb	74.48% <0.00%> (-5.77%)	⬇️
app/models/spamaway.rb	92.30% <0.00%> (-2.57%)	⬇️
app/controllers/notes_controller.rb	81.85% <0.00%> (-1.62%)	⬇️
... and 6 more

[sangu09]

@publiclab/reviewers can someone please review it. Thanks!

[jywarren]

Looks great!!! Thanks so much!

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[jywarren]

Awesome!!! 👍 🎉 🎉 🎉 🎉 🎉