Enlarge the "Edit a resource" modal

[feloy]

Fixes #4225

Also removes the ACE Editor margin mark which becomes visible when enlarging the editor zone

[codecov]

Codecov Report

Merging #4412 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4412   +/-   ##
=======================================
  Coverage   46.72%   46.72%           
=======================================
  Files         200      200           
  Lines        9380     9380           
  Branches      107      107           
=======================================
  Hits         4383     4383           
  Misses       4723     4723           
  Partials      274      274

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[maciaszczykm]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: feloy, maciaszczykm

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