Delete old useless jstests folder

[submarcos]

Description

jstests is an old folder that test frontend and routing with caspjerjs / phantomjs.

capserjs an phantomjs are deprecated.
frontend test is handle by cypress
routing is now handle by backend

Related Issue

Checklist

• I have followed the guidelines in our Contributing document
• My code respects the Definition of done available in the Development section of the documentation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes
• I added an entry in the changelog file
• My commits are all using prefix convention (emoji + tag name) and references associated issues
• I added a label to the PR corresponding to the perimeter of my contribution
• The title of my PR mentionned the issue associated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.46%. Comparing base (e41fcfa) to head (49d6ffd).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4481   +/-   ##
=======================================
  Coverage   98.46%   98.46%           
=======================================
  Files         269      269           
  Lines       21471    21471           
=======================================
  Hits        21142    21142           
  Misses        329      329           

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[cypress]

Geotrek-admin    Run #10917

Run Properties:   Passed #10917  •  4510420423 ℹ️: Merge 49d6ffd1b3c0c8afd7c46c56ea8680102930057b into b3bfd2291efc774a098fad6f76f2...

Project	Geotrek-admin
Branch Review	refs/pull/4481/merge
Run status	Passed #10917
Run duration	02m 00s
Commit	4510420423 ℹ️: Merge 49d6ffd1b3c0c8afd7c46c56ea8680102930057b into b3bfd2291efc774a098fad6f76f2...
Committer	Jean-Etienne Castagnede
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	22
View all changes introduced in this branch ↗︎