fix: console errors in tests

[zoltanbedi]

There were some annoying console errors when tests run. Also fixed typescript errors in tests.

There are still 2 more console warning about components not compatible with React 16.9.
react-quill and react-autosuggest
react-autosuggest warning moroshko/react-autosuggest#681 (comment) is going to go away once released.
react-quill is waiting for zenoamaro/react-quill#549. It might not get merged anytime soon.

[codecov]

Codecov Report

Merging #603 into develop will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #603      +/-   ##
===========================================
+ Coverage    91.56%   91.58%   +0.02%     
===========================================
  Files          198      198              
  Lines         5403     5404       +1     
  Branches      1377     1376       -1     
===========================================
+ Hits          4947     4949       +2     
+ Misses         456      455       -1     

Impacted Files	Coverage Δ
.../sn-controls-react/src/fieldcontrols/TagsInput.tsx	98.13% <100.00%> (+0.93%)	⬆️
...eact/src/ContentList/CellTemplates/ActionsCell.tsx	100.00% <100.00%> (ø)
...s-react/src/ContentList/CellTemplates/DateCell.tsx	100.00% <100.00%> (ø)
...ct/src/ContentList/CellTemplates/ReferenceCell.tsx	100.00% <100.00%> (ø)
...ist-controls-react/src/ContentList/ContentList.tsx	97.75% <100.00%> (-0.05%)	⬇️

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[sensenet]

Site name	Url	Last deploy
sn-app-dev	https://5e73da51c2458bc035992037--sn-app-dev.netlify.com	Thu Mar 19 2020 - 20:47:15 GMT+0000 (Coordinated Universal Time)
sn-react-component-docs-dev	https://5e73da41842a499de4c0c26c--sn-react-component-docs-dev.netlify.com	Thu Mar 19 2020 - 20:46:58 GMT+0000 (Coordinated Universal Time)

[herflis]

🕵️‍♂️

[enikonemeth]

🥇