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

[yash-samsung]

SUMMARY

Adding chart examples in the gallery which were missing for below chart types:

1. Mixed Time-Series
2. Parallel Coordinates
3. Partition Chart
4. Pivot Table (legacy)
5. Pivot Table v2
6. Time-Series Table
7. Time-Series Percent Change

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:

As it can be seen in after image, examples will be loaded for all the seven chart types mentioned above.

TESTING INSTRUCTIONS

At the time of selecting a chart type from the gallery, examples will be visible on UI for all the sever mentioned chart types.

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 examples will be loaded on UI. It won't change 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 #22766 (5df8e5f) into master (ad758c0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #22766   +/-   ##
=======================================
  Coverage   67.26%   67.26%           
=======================================
  Files        1875     1875           
  Lines       71762    71762           
  Branches     7854     7854           
=======================================
  Hits        48268    48268           
  Misses      21469    21469           
  Partials     2025     2025           

Flag	Coverage Δ
javascript	53.73% <ø> (ø)

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

Impacted Files	Coverage Δ
...acy-plugin-chart-parallel-coordinates/src/index.js	66.66% <ø> (ø)
...plugins/legacy-plugin-chart-partition/src/index.js	66.66% <ø> (ø)
...ugins/legacy-plugin-chart-pivot-table/src/index.js	66.66% <ø> (ø)
...gins/legacy-preset-chart-nvd3/src/Compare/index.js	66.66% <ø> (ø)
.../plugin-chart-echarts/src/MixedTimeseries/index.ts	25.00% <ø> (ø)
...ugins/plugin-chart-pivot-table/src/plugin/index.ts	66.66% <ø> (ø)
...set-frontend/src/visualizations/TimeTable/index.ts	66.66% <ø> (ø)

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[villebro]

LGTM

[rusackas]

Love it! Thank you again!