Improve profile tests and use a cutout when possible

[mwcraig]

This PR does three things:

1. Flesh out the radial profile test with background a bit more.
2. Add a test of finding the center of a dim star (fixes find_center fails badly if the star is faint #352)
3. Use a cutout instead of the full data set inside CenterAndProfile for calculating the profile to improve performance (fixes CenterAndProfile is slow... #331)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.33%. Comparing base (36aa59e) to head (823f853).
Report is 371 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #354      +/-   ##
==========================================
+ Coverage   75.20%   75.33%   +0.12%     
==========================================
  Files          27       27              
  Lines        3594     3608      +14     
==========================================
+ Hits         2703     2718      +15     
+ Misses        891      890       -1     

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[JuanCab]

Mostly comments needing changes, although it does have me wondering although it has me wondering if there should be a check in the code for the cutout being too small to correctly fit the profile?

[JuanCab]

I am not following how this is a test that the cutoff can be smaller than the profile radius.

From reviewing the code of this test, it looks like you are testing that if the cutout is smaller than needed for the profile radius, the size of the cutout will be adjusted accordingly. Can you clarify the comment accordingly.

[JuanCab]

All the changes look good.