[#3081] New modal design for plan-previews

[jiromaykin]

cut modal from list in create-new-plan and show list/previews in steps:
https://taiga.maykinmedia.nl/project/open-inwoner/task/3081

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.16%. Comparing base (5d199cc) to head (c5355c0).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1657   +/-   ##
========================================
  Coverage    94.16%   94.16%           
========================================
  Files         1086     1086           
  Lines        40109    40109           
========================================
  Hits         37767    37767           
  Misses        2342     2342           

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