Destroy wallet payment source on source destroy

[tvdeyen]

Summary

A wallet payment source without an actual payment source does not make any sense.

Checklist

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• I have written a thorough PR description.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.14%. Comparing base (127d02c) to head (4ca261c).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5836   +/-   ##
=======================================
  Coverage   89.14%   89.14%           
=======================================
  Files         744      744           
  Lines       17343    17343           
=======================================
  Hits        15460    15460           
  Misses       1883     1883           

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