SHARE-550 Media Library improvements

[schaubes]

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• Include the name and id of the Jira ticket in the PR’s title eg.: SHARE-666 The devils ticket
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Additional Description

• BREAKING: Renaming and refactoring of test commands to unify testing
• show spinner until elements have loaded
• remove thumb resize functionality as it was broken and seems unnecessary
• remove jQuery

Tests - additional information

No additional information

[codecov]

Codecov Report

Merging #3954 (7f4effa) into develop (2ef2e48) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@              Coverage Diff              @@
##             develop    #3954      +/-   ##
=============================================
- Coverage      50.02%   50.02%   -0.01%     
- Complexity      5713     5722       +9     
=============================================
  Files            654      656       +2     
  Lines          20474    20502      +28     
=============================================
+ Hits           10242    10256      +14     
- Misses         10232    10246      +14     

Flag	Coverage Δ
behat	47.86% <0.00%> (+<0.01%)	⬆️
phpunit	8.70% <0.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
...Controller/MediaLibrary/MediaPackageController.php	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

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[schaubes]

@dmetzner Ich hab die npm Tests neu strukturiert und die PHP Tests hinzugefügt. Ich finds praktischer so, was haltest du davon?