Use DISABLED test property for different_hierarchies test

[knoepfel]

This way, the test is explicit

⋮
      Start 14: class_registration
14/86 Test #14: class_registration ......................   Passed    0.02 sec
      Start 15: different_hierarchies
15/86 Test #15: different_hierarchies ...................***Not Run (Disabled)   0.00 sec
      Start 16: filter_impl
16/86 Test #16: filter_impl .............................   Passed    0.02 sec

⋮

100% tests passed, 0 tests failed out of 85

Label Time Summary:
DEFAULT    =  25.56 sec*proc (66 tests)
RELEASE    =  25.56 sec*proc (66 tests)

Total Test time (real) =  27.95 sec

The following tests did not run:
         15 - different_hierarchies (Disabled)

And the return code of the ctest command is still 0 if all enabled tests succeed.

[greenc-FNAL]

Sorry, didn't even know this was an option. I'm slipping …

[knoepfel]

Sorry, didn't even know this was an option. I'm slipping …

I didn't know about it either until I saw #488 (comment).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #492      +/-   ##
==========================================
- Coverage   85.58%   85.49%   -0.09%     
==========================================
  Files         142      142              
  Lines        3586     3586              
  Branches      615      615              
==========================================
- Hits         3069     3066       -3     
  Misses        311      311              
- Partials      206      209       +3     

Flag	Coverage Δ
unittests	85.49% <ø> (-0.09%)	⬇️

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