Add vitest tests to Gitpod

[yardenshoham]

The vitest PR is merged, we can now add vitest to Gitpod's testing pane

• Switch from jest to vitest #21444

We couldn't use jest in the same manner because we had to customize NODE_OPTIONS.

Screenshot (look at all the cool stuff circled in red):

[codecov-commenter]

Codecov Report

Merging #21449 (5ad921d) into main (9dc264a) will increase coverage by 0.29%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #21449      +/-   ##
==========================================
+ Coverage   47.30%   47.60%   +0.29%     
==========================================
  Files        1023     1023              
  Lines      139337   139337              
==========================================
+ Hits        65910    66325     +415     
+ Misses      65448    65004     -444     
- Partials     7979     8008      +29     

Impacted Files	Coverage Δ
models/git/protected_tag.go	51.47% <0.00%> (-16.18%)	⬇️
models/asymkey/gpg_key_common.go	52.63% <0.00%> (-3.95%)	⬇️
modules/queue/queue_channel.go	80.55% <0.00%> (-2.78%)	⬇️
models/perm/access/access.go	60.66% <0.00%> (-2.00%)	⬇️
models/issues/pull.go	50.20% <0.00%> (-1.85%)	⬇️
services/pull/pull.go	40.31% <0.00%> (+0.15%)	⬆️
services/gitdiff/gitdiff.go	68.13% <0.00%> (+0.94%)	⬆️
modules/charset/charset.go	73.91% <0.00%> (+2.17%)	⬆️
modules/util/timer.go	100.00% <0.00%> (+14.28%)	⬆️
services/migrations/github.go	64.01% <0.00%> (+63.42%)	⬆️

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