infra: ignore vitest temp config

[ST-DDT]

Vitest creates a temp config tsconfig.vitest-temp.json while it is running.
This can easily be checked in and commited by accident.

• See 2cf192a (#3070)

This PR adds it to the .gitignore list to prevent that issue in the future.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.97%. Comparing base (7847ee9) to head (268c076).
Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3199      +/-   ##
==========================================
+ Coverage   99.95%   99.97%   +0.01%     
==========================================
  Files        2796     2796              
  Lines      216704   216704              
  Branches      948      959      +11     
==========================================
+ Hits       216605   216645      +40     
+ Misses         99       59      -40     

see 2 files with indirect coverage changes