Fix prefix merge and enable long running

[shosseinimotlagh]

No description provided.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 65.57377% with 21 lines in your changes missing coverage. Please review.

Project coverage is 67.60%. Comparing base (1a0cef8) to head (b19e743).
Report is 206 commits behind head on master.

Files with missing lines	Patch %	Lines
src/include/homestore/btree/detail/prefix_node.hpp	66.66%	10 Missing and 9 partials ⚠️
...clude/homestore/btree/detail/btree_remove_impl.ipp	50.00%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           master     #729       +/-   ##
===========================================
+ Coverage   56.51%   67.60%   +11.08%     
===========================================
  Files         108      109        +1     
  Lines       10300    12248     +1948     
  Branches     1402     1711      +309     
===========================================
+ Hits         5821     8280     +2459     
+ Misses       3894     3093      -801     
- Partials      585      875      +290     

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