Migrate Webpack to Vite build system

[christianlupus]

Topic and Scope

This will migrate to Vite packer finally

Concerns/issues

This is not finally tested 😉

Formal requirements

There are some formal requirements that should be satisfied. Please mark those by checking the corresponding box.

• I did check that the app can still be opened and does not throw any browser logs
• I created tests for newly added PHP code (check this if no PHP changes were made)
• I updated the OpenAPI specs and added an entry to the API changelog (check if API was not modified)
• I notified the matrix channel if I introduced an API change

[github-actions]

Test Results

   12 files    584 suites   1m 38s ⏱️
  575 tests   575 ✅ 0 💤 0 ❌
2 300 runs  2 299 ✅ 1 💤 0 ❌

Results for commit 21c30e1.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.56%. Comparing base (380a4a8) to head (21c30e1).
Report is 118 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2507   +/-   ##
=======================================
  Coverage   78.56%   78.56%           
=======================================
  Files          95       95           
  Lines        2762     2762           
=======================================
  Hits         2170     2170           
  Misses        592      592           

Flag	Coverage Δ
integration	21.14% <ø> (ø)
migration	5.46% <ø> (ø)
unittests	56.44% <ø> (ø)

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