fix(csv-export): pivot v2 with verbose names

[villebro]

SUMMARY

When exporting a pivoted CSV for the Pivot v2 chart with columns or metrics that have a verbose name, the export fails. This adds the option of passing the verbose_map from the datasource to the get_column_name and get_metric_name util functions + adds some missing tests. Note that remapping the column names is usually not needed, hence mapping is optional.

TESTING INSTRUCTIONS

1. Create a Pivot v2 using the FCC 2018 Survey example dataset
2. Set the metric as the saved metric "COUNT(*)"
3. Set the columns as "Job location preference"
4. Set the rows as "Willing to relocate"
5. Export a Pivoted CSV and observe a 500

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

[codecov]

Codecov Report

Merging #18633 (9b3bfe5) into master (28e729b) will increase coverage by 0.00%.
The diff coverage is 86.76%.

❗ Current head 9b3bfe5 differs from pull request most recent head 51cec08. Consider uploading reports for the commit 51cec08 to get more accurate results

@@           Coverage Diff           @@
##           master   #18633   +/-   ##
=======================================
  Coverage   66.31%   66.32%           
=======================================
  Files        1595     1595           
  Lines       62599    62603    +4     
  Branches     6297     6297           
=======================================
+ Hits        41513    41519    +6     
+ Misses      19440    19438    -2     
  Partials     1646     1646           

Flag	Coverage Δ
hive	52.14% <67.85%> (-0.01%)	⬇️
mysql	81.27% <78.57%> (+<0.01%)	⬆️
postgres	81.32% <78.57%> (+<0.01%)	⬆️
presto	51.98% <67.85%> (-0.01%)	⬇️
python	81.75% <78.57%> (+<0.01%)	⬆️
sqlite	81.02% <78.57%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...t-frontend/src/explore/reducers/getInitialState.ts	0.00% <ø> (ø)
superset-frontend/src/utils/localStorageHelpers.ts	90.00% <ø> (ø)
superset/viz.py	58.13% <33.33%> (ø)
superset/views/core.py	77.59% <50.00%> (ø)
superset/charts/post_processing.py	67.17% <57.14%> (-1.05%)	⬇️
...nd/src/explore/components/DataTablesPane/index.tsx	74.44% <86.66%> (ø)
.../src/explore/components/DataTableControl/index.tsx	97.36% <93.75%> (ø)
...set-frontend/src/explore/actions/exploreActions.ts	47.36% <100.00%> (ø)
...et-frontend/src/explore/reducers/exploreReducer.js	33.33% <100.00%> (ø)
superset-frontend/src/utils/common.js	88.67% <100.00%> (ø)
... and 11 more

---

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 28e729b...51cec08. Read the comment docs.

[kgabryje]

Looks great, thank you for the fix!