feat: improve embedded data table in text reports

[betodealmeida]

SUMMARY

This PR improves the data table that is embedded in the email/slack notifications as text for reports.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

After:

TESTING INSTRUCTIONS

Create a report as "text" and send to email.

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

[hughhhh]

LGTM

[codecov]

Codecov Report

Merging #16335 (09b9d01) into master (7a284bb) will decrease coverage by 0.27%.
The diff coverage is 69.84%.

@@            Coverage Diff             @@
##           master   #16335      +/-   ##
==========================================
- Coverage   76.65%   76.37%   -0.28%     
==========================================
  Files         999     1000       +1     
  Lines       53394    53458      +64     
  Branches     6817     6817              
==========================================
- Hits        40929    40831      -98     
- Misses      12228    12390     +162     
  Partials      237      237              

Flag	Coverage Δ
hive	?
mysql	81.54% <69.84%> (-0.09%)	⬇️
postgres	81.56% <69.84%> (-0.13%)	⬇️
presto	?
python	81.65% <69.84%> (-0.55%)	⬇️
sqlite	81.17% <69.84%> (-0.17%)	⬇️

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

Impacted Files	Coverage Δ
superset/charts/post_processing.py	72.27% <41.66%> (-21.90%)	⬇️
superset/charts/api.py	85.82% <50.00%> (ø)
superset/reports/commands/execute.py	90.23% <62.50%> (-2.36%)	⬇️
superset/reports/notifications/slack.py	87.14% <80.00%> (+0.18%)	⬆️
superset/utils/csv.py	97.61% <90.00%> (-2.39%)	⬇️
superset/common/query_actions.py	92.95% <100.00%> (+0.10%)	⬆️
superset/reports/commands/exceptions.py	98.79% <100.00%> (+0.06%)	⬆️
superset/reports/notifications/email.py	100.00% <100.00%> (ø)
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
superset/db_engine_specs/hive.py	69.80% <0.00%> (-16.87%)	⬇️
... and 8 more

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[rosemarie-chiu]

🏷 2021.31