minify leaflet scripts using uglifier

[Tlazypanda]

Fixes #8158

Minified leaflet scripts using Uglifier.

• PR is descriptively titled 📑 and links the original issue above 🔗
• tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR -- or run tests locally with rake test
• code is in uniquely-named feature branch and has no merge conflicts 📁
• screenshots/GIFs are attached 📎 in case of UI updation
• ask @publiclab/reviewers for help, in a comment below

Screenshots

Minify js suggestion not present anymore

[gitpod-io]

[codecov]

Codecov Report

Merging #8159 into main will increase coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #8159      +/-   ##
==========================================
+ Coverage   82.10%   82.22%   +0.12%     
==========================================
  Files         100      100              
  Lines        5751     5751              
==========================================
+ Hits         4722     4729       +7     
+ Misses       1029     1022       -7     

Impacted Files	Coverage Δ
app/api/srch/search.rb	70.06% <0.00%> (+3.82%)	⬆️
app/services/execute_search.rb	94.44% <0.00%> (+5.55%)	⬆️

[Tlazypanda]

@jywarren @cesswairimu can you kindly review? Thanks ✌️

[jywarren]

Will these then be grabbed automatically by asset pipeline? Awesome, thank you @Tlazypanda you're really an expert in all this!!!

[Tlazypanda]

@jywarren @cesswairimu on checking the performance the Uglifier scripts to be minified are not getting minified #8159 but locally they are so maybe fetching from cache can we do a manual rake assets:precompile (possibly after removing the assets folder once) and then letting it build a fresh assets folder 😅

[jywarren]

Perhaps you could write this into a Rails migration, sit hat it automatically runs upon publishing to stable and production? What do you think? I'm happy to help with that if you want to open a PR !