Remove plugins views

[soupette]

What does it do?

This PR removes the plugin from the admin in order to be able to migrate the views more easily.
It also fixes and commented some tests.

[codecov]

Codecov Report

Merging #10764 (3e8a7dc) into v4/ds-migration (9e887a2) will not change coverage.
The diff coverage is n/a.

❗ Current head 3e8a7dc differs from pull request most recent head 4b6341a. Consider uploading reports for the commit 4b6341a to get more accurate results

@@               Coverage Diff                @@
##           v4/ds-migration   #10764   +/-   ##
================================================
  Coverage            57.73%   57.73%           
================================================
  Files                  183      183           
  Lines                 6466     6466           
  Branches              1343     1343           
================================================
  Hits                  3733     3733           
  Misses                2263     2263           
  Partials               470      470           

Flag	Coverage Δ
front	∅ <ø> (?)
unit	57.73% <ø> (ø)

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[HichamELBSI]

LGTM