ensure consistent output of link postfix for label, ssml, root node

[zorkow]

This improves the inclusion of the link counter:

• adds it correctly into the post fix for both speech and ssml
• also ensures it is added to top level label and ssml

[codecov]

Codecov Report

❌ Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.57%. Comparing base (1f41894) to head (8e39d59).
⚠️ Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
ts/common/processor_factory.ts	0.00%	14 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #834      +/-   ##
===========================================
- Coverage    91.60%   91.57%   -0.03%     
===========================================
  Files          165      165              
  Lines        40216    40224       +8     
  Branches      4359     4333      -26     
===========================================
- Hits         36839    36837       -2     
- Misses        3377     3387      +10     

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