fix(plugin-chart-echarts): [feature parity] annotation line chart color does not work

[stephenLYZ]

SUMMARY

This PR fixes the problem that the annotation line chart color of time-series echart does not work.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

before

2022-04-18.10.46.47.mov

after

2022-04-18.10.45.16.mov

TESTING INSTRUCTIONS

Follow up this issue #19299.
See the result.

ADDITIONAL INFORMATION

• Has associated issue: Annotation line chart color cannot be changed  #19299
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #19758 (3b4115a) into master (57157c8) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #19758   +/-   ##
=======================================
  Coverage   66.51%   66.51%           
=======================================
  Files        1687     1687           
  Lines       64620    64621    +1     
  Branches     6646     6647    +1     
=======================================
+ Hits        42980    42981    +1     
  Misses      19940    19940           
  Partials     1700     1700           

Flag	Coverage Δ
javascript	51.19% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...hart-echarts/src/MixedTimeseries/transformProps.ts	0.00% <ø> (ø)
...gin-chart-echarts/src/Timeseries/transformProps.ts	57.89% <ø> (ø)
...lugin-chart-echarts/src/Timeseries/transformers.ts	51.63% <100.00%> (+0.39%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 57157c8...3b4115a. Read the comment docs.

[satiukov-ed]

Will it be possible to change color of markers? I think this may be the case because there are situations when you need to add an annotation that consists of one point only.

[villebro]

LGTM, thanks for fixing this! And bonus points for remembering Mixed Timeseries (the one everyone always forgets 😆 )