TypeScript upgrade 5.8.x

[jotak]

Also bumping eslint, jest ...
Migrate to new eslint config format

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[jotak]

This is a huge bump, but typescript itself sounds ok, most of the remaining issues are related to eslint, currently many related errors to fix

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.24%. Comparing base (489bd5d) to head (784ff12).

❗ There is a different number of reports uploaded between BASE (489bd5d) and HEAD (784ff12). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (489bd5d)	HEAD (784ff12)
uitests	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #848      +/-   ##
==========================================
- Coverage   55.17%   49.24%   -5.93%     
==========================================
  Files         199       39     -160     
  Lines       10612     3314    -7298     
  Branches     1230        0    -1230     
==========================================
- Hits         5855     1632    -4223     
+ Misses       4387     1516    -2871     
+ Partials      370      166     -204     

Flag	Coverage Δ
uitests	?
unittests	49.24% <ø> (ø)

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see 160 files with indirect coverage changes

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