removes the stale Rsvd_truncate_test.cpp file

[manuschneider]

the tests are included in Rsvd_test.cpp after a renaming of functions

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.89%. Comparing base (ebe7919) to head (4f7423c).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1188   +/-   ##
=======================================
  Coverage   68.89%   68.89%           
=======================================
  Files         208      208           
  Lines       22411    22411           
  Branches       72       72           
=======================================
  Hits        15439    15439           
  Misses       6950     6950           
  Partials       22       22           

Flag	Coverage Δ
cpp	68.97% <ø> (ø)
python	63.96% <ø> (ø)

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Components	Coverage Δ
C++ backend	68.97% <ø> (ø)
Python bindings	∅ <ø> (∅)
Python package	63.96% <ø> (ø)

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