test: added optimizer integration test back

[maximilianwerk]

PR for adding back the optimizer test and adopt the optimizer to the 2.0 API.

[codecov]

Codecov Report

Merging #2519 (16eb8fd) into master (7d901e8) will increase coverage by 2.57%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2519      +/-   ##
==========================================
+ Coverage   83.46%   86.04%   +2.57%     
==========================================
  Files         152      152              
  Lines        9417     9415       -2     
==========================================
+ Hits         7860     8101     +241     
+ Misses       1557     1314     -243     

Flag	Coverage Δ
daemon	46.79% <0.00%> (+<0.01%)	⬆️
jina	86.02% <100.00%> (+2.75%)	⬆️

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Impacted Files	Coverage Δ
jina/optimizers/__init__.py	87.61% <100.00%> (+87.61%)	⬆️
jina/optimizers/flow_runner.py	97.67% <100.00%> (+97.67%)	⬆️
jina/peapods/pods/__init__.py	85.40% <0.00%> (-4.66%)	⬇️
jina/jaml/parsers/__init__.py	100.00% <0.00%> (+7.31%)	⬆️
jina/optimizers/parameters.py	67.50% <0.00%> (+67.50%)	⬆️
jina/optimizers/discovery.py	80.26% <0.00%> (+80.26%)	⬆️
jina/parsers/optimizer.py	100.00% <0.00%> (+100.00%)	⬆️
jina/jaml/parsers/default/v1.py	100.00% <0.00%> (+100.00%)	⬆️

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