Uncallable @depends will warn instead of just skip

[epdenouden]

Implements #3517

[codecov]

Codecov Report

Merging #3525 into 7.5 will increase coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                7.5    #3525      +/-   ##
============================================
+ Coverage     83.39%   83.41%   +0.02%     
- Complexity     3623     3627       +4     
============================================
  Files           143      143              
  Lines          9648     9662      +14     
============================================
+ Hits           8046     8060      +14     
  Misses         1602     1602

Impacted Files	Coverage Δ	Complexity Δ
src/Framework/TestCase.php	76.09% <100%> (+0.41%)	308 <2> (+4)	⬆️

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