chore(core): remove test-dint and image makefile entries

[CarliJoy]

they both have been replaced by proper pytest tests

follow up of #714

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #725   +/-   ##
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  Coverage        ?   84.82%           
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  Files           ?       12           
  Lines           ?      659           
  Branches        ?      103           
=======================================
  Hits            ?      559           
  Misses          ?       78           
  Partials        ?       22           

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