fix: Revert #20408 (stacking negative values in echarts bar chart)

[rusackas]

This reverts commit c959d92.

The PR being reverted bumped echarts and changes the stacking method to allow proper stacking of negative values (cool!). However, if a dataset happens to display null values as bar segments, clicking on the legend causes the chart display to become VERY erratic in terms of what's displayed/hidden in the stacked bars - things disappear completely!

SUMMARY

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

problem_bar.mp4

After: coming soon... but it works, trust me ;)

TESTING INSTRUCTIONS

Create a dataset with this query

SELECT TO_DATE('2011-01-01', 'yyyy-MM-dd') as d, 1 as city, 1 as count
union all SELECt TO_DATE('2011-01-01', 'yyyy-MM-dd'), 1, 1
union all SELECt TO_DATE('2011-01-01', 'yyyy-MM-dd'), 1, null
union all SELECt TO_DATE('2011-01-01', 'yyyy-MM-dd'), 2, 1
union all SELECt TO_DATE('2011-01-01', 'yyyy-MM-dd'), 2, null
union all SELECt TO_DATE('2012-01-01', 'yyyy-MM-dd'), 2, null
union all SELECt TO_DATE('2013-01-01', 'yyyy-MM-dd'), 2, null
union all SELECt TO_DATE('2013-01-01', 'yyyy-MM-dd'), 2, 1

...then make Timeseries Bar Chart V2 as shown in the GIF. Click around on the labels and see if you see all the right bars at all times.

ADDITIONAL INFORMATION

• Has associated issue:
• 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

[michael-s-molina]

LGTM

[codecov]

Codecov Report

Merging #20571 (9121108) into master (edb1383) will not change coverage.
The diff coverage is n/a.

❗ Current head 9121108 differs from pull request most recent head 0314543. Consider uploading reports for the commit 0314543 to get more accurate results

@@           Coverage Diff           @@
##           master   #20571   +/-   ##
=======================================
  Coverage   66.81%   66.81%           
=======================================
  Files        1752     1752           
  Lines       65478    65478           
  Branches     6916     6916           
=======================================
  Hits        43750    43750           
  Misses      19980    19980           
  Partials     1748     1748           

Flag	Coverage Δ
javascript	51.80% <ø> (ø)

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

Impacted Files	Coverage Δ
...lugin-chart-echarts/src/Timeseries/transformers.ts	50.00% <ø> (ø)

---

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 edb1383...0314543. Read the comment docs.

[kgabryje]

Lgtm