initial pagy install for tag page pagination, to solve will_paginate issues

[jywarren]

Fixes #7334 with guidance from https://ddnexus.github.io/pagy/migration-guide

@Tlazypanda check out https://github.com/ddnexus/pagy - it makes a strong case that this gem is vastly more efficient for pagination, and i wonder if this will help us overall on performance. Testing on this route first.

https://ddnexus.github.io/pagy/index

[gitpod-io]

[codecov]

Codecov Report

Merging #8326 into main will increase coverage by 0.70%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##             main    #8326      +/-   ##
==========================================
+ Coverage   81.28%   81.98%   +0.70%     
==========================================
  Files         101      101              
  Lines        5872     5902      +30     
==========================================
+ Hits         4773     4839      +66     
+ Misses       1099     1063      -36     

Impacted Files	Coverage Δ
app/controllers/spam2_controller.rb	71.84% <83.33%> (+10.30%)	⬆️
app/controllers/batch_controller.rb	90.19% <100.00%> (+22.23%)	⬆️
app/controllers/home_controller.rb	98.38% <100.00%> (ø)
app/controllers/tag_controller.rb	81.45% <100.00%> (+0.05%)	⬆️
app/helpers/application_helper.rb	84.70% <100.00%> (+0.18%)	⬆️
app/models/node.rb	91.37% <100.00%> (+0.18%)	⬆️
app/models/tag.rb	97.53% <100.00%> (+0.06%)	⬆️
app/api/srch/search.rb	70.06% <0.00%> (+3.82%)	⬆️
app/services/execute_search.rb	94.44% <0.00%> (+5.55%)	⬆️
... and 1 more

[jywarren]

OK, looking all right here:

I'll push this to unstable!

[jywarren]

Pushed it here! https://unstable.publiclab.org/tag/water-quality

[jywarren]

Seeing some issues with wiki pages appearing on 2 subsequent pages. Checking on live site to see if that's unique:

https://unstable.publiclab.org/wiki/tag/water-quality shows Tortuga Guardian, Oil and Gas Water Quality, and Simple Water Sensor Platform on page 2 as well: https://unstable.publiclab.org/wiki/tag/water-quality?page=2

(UPDATE: this exists on production too)

[jywarren]

Also https://unstable.publiclab.org/questions/tag/water-quality shows 2x pagination due to the Answers code, which we should remove. (UPDATE: confirmed this exists on production too.)

[jywarren]

OK, we should be good to merge this. I don't know that it will fix #7334 -- but let's see.

[Tlazypanda]

Hey @jywarren Yess this was on my up-for-discussion list in #7883 ✌️ maybe I should open another pr with some more routes migrated to Pagy 😅

[Tlazypanda]

Linking this work to migrate to pagy issue #8426

[cesswairimu]

Thanks Sneha 🚀