fix(chart): ensure samples data is displayed

[pkdotson]

SUMMARY

This pr fixes an issue where the view samples tab does not show the sample data. This problem was seen because the column names weren't updated for the samples tab since the old legacy endpoint does not return columns.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

after
https://user-images.githubusercontent.com/17326228/135015945-ba291b18-3526-4d94-866f-9b980af24f3d.mov

TESTING INSTRUCTIONS

Open up charts that use both legacy and new /chart enpoints and ensure that the VIEW SAMPLES show up in the datatables pane.

ADDITIONAL INFORMATION

• [x ] Has associated issue: Fixes [explore][sample table] Sample table show ' no data' when there are rows retrieved #16661
• 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 #16900 (e7ea74a) into master (1fbce88) will decrease coverage by 0.12%.
The diff coverage is 77.27%.

@@            Coverage Diff             @@
##           master   #16900      +/-   ##
==========================================
- Coverage   77.13%   77.01%   -0.13%     
==========================================
  Files        1036     1038       +2     
  Lines       55729    56001     +272     
  Branches     7627     7742     +115     
==========================================
+ Hits        42989    43131     +142     
- Misses      12484    12612     +128     
- Partials      256      258       +2     

Flag	Coverage Δ
javascript	71.22% <77.27%> (-0.20%)	⬇️

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

Impacted Files	Coverage Δ
.../src/explore/components/DataTableControl/index.tsx	98.21% <ø> (ø)
...nd/src/explore/components/DataTablesPane/index.tsx	85.58% <77.27%> (-0.13%)	⬇️
...rset-frontend/src/components/DeleteModal/index.tsx	92.00% <0.00%> (-8.00%)	⬇️
...hboard/components/nativeFilters/FilterBar/state.ts	82.81% <0.00%> (-4.69%)	⬇️
...ols/FilterControl/AdhocFilterEditPopover/index.jsx	66.10% <0.00%> (-3.35%)	⬇️
superset-frontend/src/chart/Chart.jsx	40.29% <0.00%> (-3.04%)	⬇️
...frontend/src/components/TimezoneSelector/index.tsx	95.45% <0.00%> (-2.28%)	⬇️
...tend/src/common/hooks/apiResources/apiResources.ts	92.50% <0.00%> (-2.24%)	⬇️
.../src/dashboard/components/gridComponents/Chart.jsx	78.37% <0.00%> (-2.00%)	⬇️
superset-frontend/src/explore/constants.ts	95.74% <0.00%> (-1.63%)	⬇️
... and 31 more

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[kgabryje]

/testenv up

[kgabryje]

Can we add some unit tests?

[github-actions]

@kgabryje Ephemeral environment spinning up at http://52.12.82.82:8080. Credentials are admin/admin. Please allow several minutes for bootstrapping and startup.

[jinghua-qa]

LGTM

[kgabryje]

Looks nice! I left a comment with a suggestion how to simplify the logic of setting column names

[kgabryje]

LGTM

[github-actions]

Ephemeral environment shutdown and build artifacts deleted.