chore(core): remove unneeded file sampling.ts

[Flarna]

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
• Documentation has been updated

[Flarna]

Is a changelog needed for this?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.01%. Comparing base (549e0a6) to head (f789c3e).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5841   +/-   ##
=======================================
  Coverage   95.01%   95.01%           
=======================================
  Files         303      303           
  Lines        7943     7943           
  Branches     1607     1607           
=======================================
  Hits         7547     7547           
  Misses        396      396           

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[pichlermarc]

Is a changelog needed for this?

not needed - thank you for removing this 🙌

[pichlermarc]

tests are failing for unrelated reasons, #5851 will address the failing tests this while we figure out what's wrong with #5850.