Consider pruning property in Connect stage

[rhaschke]

Even if pruning was disabled, pruning could sneak in via the Connect stage.
For now fixes #737.

For me, the added unit test failed with an assertion failure, because the state copied from the Fallback to the next child was PRUNED and not ENABLED:

moveit_task_constructor/core/src/storage.cpp

Line 125 in 82a1156

assert(it->priority_.enabled());

[codecov]

Codecov Report

❌ Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 52.89%. Comparing base (c13fe5c) to head (666e7f3).

Files with missing lines	Patch %	Lines
core/src/container.cpp	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #742      +/-   ##
==========================================
+ Coverage   52.85%   52.89%   +0.05%     
==========================================
  Files         138      138              
  Lines       10628    10641      +13     
  Branches     1127     1128       +1     
==========================================
+ Hits         5616     5628      +12     
- Misses       5004     5005       +1     
  Partials        8        8              

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