MRCM export improvements

[nagyo]

No description provided.

[codecov-commenter]

Codecov Report

Merging #910 (0ee21db) into 7.x (a2ff0bd) will increase coverage by 0.00%.
The diff coverage is 65.62%.

@@            Coverage Diff            @@
##                7.x     #910   +/-   ##
=========================================
  Coverage     62.31%   62.31%           
- Complexity    11384    11385    +1     
=========================================
  Files          1611     1611           
  Lines         55064    55088   +24     
  Branches       5466     5466           
=========================================
+ Hits          34314    34329   +15     
- Misses        18528    18538   +10     
+ Partials       2222     2221    -1     

Impacted Files	Coverage Δ
.../snowowl/snomed/core/mrcm/io/JsonMrcmExporter.java	0.00% <0.00%> (ø)
...l/snowowl/snomed/core/mrcm/io/CsvMrcmExporter.java	100.00% <100.00%> (ø)
...onal/snowowl/snomed/core/tree/TerminologyTree.java	80.76% <0.00%> (-1.93%)	⬇️
.../snomed/core/ecl/SnomedEclRefinementEvaluator.java	88.79% <0.00%> (-0.22%)	⬇️
...wl/fhir/core/model/conceptmap/TranslateResult.java	83.87% <0.00%> (+6.45%)	⬆️

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[cmark]

LGTM!

[apeteri]

Not applicable to 8.x as MRCM content will be maintained in the form of reference set members.