fix(plugin-chart-table): always sort descending by first metric

[ktmud]

🐛 Bug Fix

Follow up for #930 . When there is not "Sort by" metric specified, the original logic pre the API migration is to always sort by the first metric in descending order, regardless if "Sort descending" is set.

Did some refactoring on table chart's buildQuery:

• Introduce a more general ensureIsArray utils, as replacement for extractTimeseriesLimitMetric
• Change queryMode inference logic to be the same as in the control panel configs.

I'm also slipping a small refactor on buildQueryObject where null values are fell back to undefined so that nulls are not sent to the backend. Even thought the backend has now taken care of nulls as well: apache/superset#12905

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[villebro]

Many nice improvements!

[codecov]

Codecov Report

Merging #935 (265135f) into master (a8bfc55) will increase coverage by 0.05%.
The diff coverage is 60.86%.

@@            Coverage Diff             @@
##           master     #935      +/-   ##
==========================================
+ Coverage   27.37%   27.43%   +0.05%     
==========================================
  Files         412      412              
  Lines        8292     8300       +8     
  Branches     1139     1147       +8     
==========================================
+ Hits         2270     2277       +7     
- Misses       5888     5889       +1     
  Partials      134      134              

Impacted Files	Coverage Δ
plugins/plugin-chart-table/src/controlPanel.tsx	38.46% <0.00%> (ø)
plugins/plugin-chart-table/src/buildQuery.ts	69.56% <46.15%> (+1.14%)	⬆️
...ges/superset-ui-core/src/query/buildQueryObject.ts	100.00% <100.00%> (ø)
...ckages/superset-ui-core/src/utils/ensureIsArray.ts	100.00% <100.00%> (ø)

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