Adding integration tests for DynamicallyActivatableServiceObserver and update normal tests

[danipaniii]

In a meeting we discussed about implementing integration tests for the DynamicallyActivatableServiceObserver and with this PR those should be implemented.

Reference: #1527

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This change is 

[codecov]

Codecov Report

Merging #1545 (96b82a4) into master (6b9c5d1) will increase coverage by 0.04%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1545      +/-   ##
============================================
+ Coverage     77.46%   77.50%   +0.04%     
  Complexity     2319     2319              
============================================
  Files           240      240              
  Lines          7728     7728              
  Branches        923      923              
============================================
+ Hits           5986     5989       +3     
+ Misses         1354     1351       -3     
  Partials        388      388              

Impacted Files	Coverage Δ
...entation/transformer/AbstractClassTransformer.java	83.81% <0.00%> (-0.95%)	⬇️
...it/ocelot/core/exporter/JaegerExporterService.java	72.88% <0.00%> (+6.78%)	⬆️

[heiko-holz]

Reviewed 1 of 1 files at r3, 2 of 2 files at r4, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @danipaniii)