chore: adding missing examples in the gallery for several chart types

[yash-samsung]

SUMMARY

Adding chart examples which were missing in the gallery for these chart types: Dual Line Chart, Event Flow, Filter box, Funnel Chart, Gauge Chart, Graph Chart, Handlebars, Multiple Line Charts, Radar Chart and Nightingale Rose Chart.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

(Please note that text in red 'No Example' just to show/visualize that there are no examples. In actual, it remains empty)

After:

Before there was no example at the time of selecting chart type in the gallery. Now examples will be loaded as it can be seen in the after image in lower right 'Examples' section. Above example is for Nightingale Rose Chart, but examples will also be loaded for these chart types: Dual Line Chart, Event Flow, Filter box, Funnel Chart, Gauge Chart, Graph Chart, Handlebars, Multiple Line Charts, Radar Chart

TESTING INSTRUCTIONS

At the time of selecting a chart type from the gallery, example will be visible for Dual Line Chart, Event Flow, Filter box, Funnel Chart, Gauge Chart, Graph Chart, Handlebars, Multiple Line Charts, Radar Chart and Nightingale Rose Chart as seen in the after screenshot above.

ADDITIONAL INFORMATION

• Has associated issue: Fixes a part of [Gallery] Some chart type in gallery do not have example #16707
• Required feature flags:
• Changes UI: Only example images will be loaded on the UI. It won't change anything the way user interacts with 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 #22597 (80b6f0a) into master (b6d39d1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #22597   +/-   ##
=======================================
  Coverage   66.91%   66.91%           
=======================================
  Files        1851     1851           
  Lines       70715    70715           
  Branches     7766     7766           
=======================================
  Hits        47320    47320           
  Misses      21373    21373           
  Partials     2022     2022           

Flag	Coverage Δ
javascript	53.85% <ø> (ø)

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

Impacted Files	Coverage Δ
...lugins/legacy-plugin-chart-event-flow/src/index.ts	50.00% <ø> (ø)
...tend/plugins/legacy-plugin-chart-rose/src/index.js	66.66% <ø> (ø)
...ins/legacy-preset-chart-nvd3/src/DualLine/index.js	66.66% <ø> (ø)
...ns/legacy-preset-chart-nvd3/src/LineMulti/index.js	66.66% <ø> (ø)
...d/plugins/plugin-chart-echarts/src/Funnel/index.ts	50.00% <ø> (ø)
...nd/plugins/plugin-chart-echarts/src/Gauge/index.ts	50.00% <ø> (ø)
...nd/plugins/plugin-chart-echarts/src/Graph/index.ts	50.00% <ø> (ø)
...nd/plugins/plugin-chart-echarts/src/Radar/index.ts	50.00% <ø> (ø)
...lugins/plugin-chart-handlebars/src/plugin/index.ts	66.66% <ø> (ø)
...c/visualizations/FilterBox/FilterBoxChartPlugin.js	66.66% <ø> (ø)
... and 7 more

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[villebro]

Thanks for tackling this! ❤️