Resolves #1697 - Bug fix of popover not closing

[jriyyya]

Signed-off-by: Riya Jain riya1jain567@gmail.com

Which problem is this PR solving?

Resolves #1697

Description of the changes

Added a z-index in TraceDiffGraph so that now when the user click outside the popup it will get closed.

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[jriyyya]

@yurishkuro You can merge this now.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4f7c754) 96.01% compared to head (16208ab) 96.01%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1705   +/-   ##
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  Coverage   96.01%   96.01%           
=======================================
  Files         241      241           
  Lines        7562     7562           
  Branches     1987     1987           
=======================================
  Hits         7261     7261           
  Misses        301      301           

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