Remove tests for removed and deprecated functionality

[djhoese]

Missed this commit after quick-merging race condition between me and @mraspaud. Addition to #2610

• Closes #xxxx
• Tests added
• Fully documented
• Add your name to AUTHORS.md if not there already

[codecov]

Codecov Report

Merging #2612 (e6261e7) into main (dc3ee7d) will increase coverage by 0.11%.
Report is 2 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2612      +/-   ##
==========================================
+ Coverage   95.07%   95.18%   +0.11%     
==========================================
  Files         354      354              
  Lines       51370    51253     -117     
==========================================
- Hits        48839    48786      -53     
+ Misses       2531     2467      -64     

Flag	Coverage Δ
behaviourtests	4.24% <ø> (+<0.01%)	⬆️
unittests	95.81% <ø> (+0.11%)	⬆️

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Files	Coverage Δ
satpy/resample.py	88.93% <ø> (-0.39%)	⬇️
satpy/tests/test_resample.py	99.59% <ø> (+10.68%)	⬆️