Adding tests around existing ArchiveNotifier duck

[tklever]

Which problem is this PR solving?

• Adding tests around existing ArchiveNotifier/duck code

Short description of the changes

• Adding tests around ArchiveNotifier/duck
• Updated a redux middleware to return next() (keeps redux promise chains intact)

[codecov]

Codecov Report

Merging #622 into master will increase coverage by 0.37%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #622      +/-   ##
==========================================
+ Coverage   93.54%   93.91%   +0.37%     
==========================================
  Files         227      227              
  Lines        5901     5901              
  Branches     1485     1485              
==========================================
+ Hits         5520     5542      +22     
+ Misses        340      319      -21     
+ Partials       41       40       -1     

Impacted Files	Coverage Δ
packages/jaeger-ui/src/middlewares/index.js	81.81% <100.00%> (+18.18%)	⬆️
packages/jaeger-ui/src/reducers/embedded.tsx	100.00% <0.00%> (+25.00%)	⬆️
packages/jaeger-ui/src/reducers/config.js	100.00% <0.00%> (+33.33%)	⬆️
packages/jaeger-ui/src/middlewares/track.tsx	75.00% <0.00%> (+37.50%)	⬆️
.../src/components/TracePage/ArchiveNotifier/duck.tsx	100.00% <0.00%> (+78.94%)	⬆️

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[yurishkuro]

Thanks!