SO-4900: Create code system upgrade sync and complete end-points

[AAAlinaaa]

No description provided.

[codecov-commenter]

Codecov Report

Merging #872 (69b8c1b) into 7.x (9de144a) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##                7.x     #872      +/-   ##
============================================
- Coverage     62.31%   62.28%   -0.03%     
- Complexity    11362    11363       +1     
============================================
  Files          1610     1610              
  Lines         54994    55016      +22     
  Branches       5457     5457              
============================================
- Hits          34270    34269       -1     
- Misses        18507    18531      +24     
+ Partials       2217     2216       -1     

Impacted Files	Coverage Δ
.../rest/codesystem/CodeSystemUpgradeRestService.java	40.54% <0.00%> (-59.46%)	⬇️
...om/b2international/index/es/log/Slf4jAppender.java	57.89% <0.00%> (-10.53%)	⬇️
.../snomed/core/ecl/SnomedEclRefinementEvaluator.java	88.79% <0.00%> (-0.22%)	⬇️
...ernational/snowowl/internal/eventbus/EventBus.java	67.82% <0.00%> (+0.49%)	⬆️
...onal/snowowl/snomed/core/tree/TerminologyTree.java	82.69% <0.00%> (+1.92%)	⬆️

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[nagyo]

LGTM!