Make ScatterPlot y-axis margin wider to fit longer durations

[tico88612]

Which problem is this PR solving?

• Resolve [Bug]: Y-axis (duration) is not accurate for long-running traces  #2180

Description of the changes

• Make ScatterPlot margin wider, 50 px => 70 px

How was this change tested?

• manual test

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.59%. Comparing base (3d9420a) to head (280920e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2211   +/-   ##
=======================================
  Coverage   96.59%   96.59%           
=======================================
  Files         254      254           
  Lines        7641     7641           
  Branches     1927     1977   +50     
=======================================
  Hits         7381     7381           
  Misses        260      260           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[yurishkuro]

Thanks!