hide legend in response time chart when it contains more than 3 rows

[artem-fedorov]

No description provided.

[codecov-io]

Codecov Report

Merging #131 into master will decrease coverage by 0.09%.
The diff coverage is 40%.

@@            Coverage Diff            @@
##           master     #131     +/-   ##
=========================================
- Coverage    67.5%   67.41%   -0.1%     
=========================================
  Files          44       44             
  Lines        3693     3701      +8     
  Branches      627      631      +4     
=========================================
+ Hits         2493     2495      +2     
- Misses        993      996      +3     
- Partials      207      210      +3

Impacted Files	Coverage Δ
.../performance/actions/PerformanceProjectAction.java	30.1% <33.33%> (-0.18%)	⬇️
...dson/plugins/performance/PerformanceReportMap.java	66.46% <75%> (-0.2%)	⬇️

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