Fix 3d effect enhancement

[mraspaud]

This PR fixes the 3d effect enhancement that was wrongly converted in dc28b1d to use map_block where it should be delayed.

Also, the enhancement tests are now running on dask array-based DataArray for more realism.

• Closes MetopC script fails after update to SatPy 0.37 #2173
• Tests added

[codecov]

Codecov Report

Merging #2174 (be9b6ce) into main (dbe2838) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2174   +/-   ##
=======================================
  Coverage   93.99%   93.99%           
=======================================
  Files         287      287           
  Lines       44092    44092           
=======================================
  Hits        41446    41446           
  Misses       2646     2646           

Flag	Coverage Δ
behaviourtests	4.78% <25.00%> (ø)
unittests	94.66% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
satpy/enhancements/__init__.py	99.15% <100.00%> (ø)
satpy/tests/enhancement_tests/test_enhancements.py	99.63% <100.00%> (ø)

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[coveralls]

Coverage remained the same at 94.612% when pulling be9b6ce on mraspaud:fix-3d-enhancement into dbe2838 on pytroll:main.

[mraspaud]

Confirmed by @lobsiger to fix the bug in #2173

[djhoese]

LGTM. Thanks for the quick fix. Feel free to merge.