Ddg optional operation

[everett980]

Which problem is this PR solving?

• Current DDG is a service & operation oriented dependency graph. We want to be able to have a service dependency graph.

Short description of the changes

• Allow operation field on focal vertex to be an array (filtered based on visibility)
• Raise request when service is specified
• Allow operation to be cleared
• Allow operation to be specified on focal node with multiple operations
• Improve DDG node hovered CSS

[codecov]

Codecov Report

Merging #488 into master will increase coverage by 0.23%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #488      +/-   ##
==========================================
+ Coverage   92.47%   92.71%   +0.23%     
==========================================
  Files         193      193              
  Lines        4611     4652      +41     
  Branches     1101     1119      +18     
==========================================
+ Hits         4264     4313      +49     
+ Misses        305      299       -6     
+ Partials       42       40       -2

Impacted Files	Coverage Δ
...ui/src/components/DeepDependencies/Graph/index.tsx	100% <ø> (ø)	⬆️
...er-ui/src/model/ddg/sample-paths.test.resources.js	100% <ø> (ø)	⬆️
...ndencies/Graph/DdgNodeContent/calc-positioning.tsx	100% <100%> (ø)	⬆️
packages/jaeger-ui/src/utils/update-ui-find.tsx	100% <100%> (ø)	⬆️
...ui/src/components/DeepDependencies/index.track.tsx	100% <100%> (ø)	⬆️
...kages/jaeger-ui/src/model/ddg/GraphModel/index.tsx	100% <100%> (ø)	⬆️
...ts/DeepDependencies/Graph/DdgNodeContent/index.tsx	100% <100%> (ø)	⬆️
...aeger-ui/src/components/DeepDependencies/index.tsx	100% <100%> (ø)	⬆️
...i/src/components/DeepDependencies/Header/index.tsx	100% <100%> (ø)	⬆️
...onents/DeepDependencies/Graph/getNodeRenderers.tsx	100% <100%> (ø)	⬆️
... and 9 more

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[everett980]

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