feat(alerts-reports): adding pdf filetype to email and slack reports

[fisjac]

SUMMARY

Adding requested pdf filetype to options for alerts and reports

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:
https://www.loom.com/share/accb313d566e413d9ee572a5da86f07c

After:
https://www.loom.com/share/7e52e6e95d094f6192cb84dea3d2a4f9

TESTING INSTRUCTIONS

Create an alert or report a dashboard or chart. Select the pdf option under content format. Save the report and activate it. The report should send as a pdf.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags: ALERT_REPORTS=True
• 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

Attention: Patch coverage is 58.46154% with 27 lines in your changes missing coverage. Please review.

Project coverage is 69.72%. Comparing base (a75bb76) to head (8328bf0).
Report is 1424 commits behind head on master.

Files with missing lines	Patch %	Lines
superset/utils/pdf.py	30.43%	16 Missing ⚠️
superset/commands/report/execute.py	50.00%	6 Missing ⚠️
...-frontend/src/features/alerts/AlertReportModal.tsx	77.77%	1 Missing and 1 partial ⚠️
superset/reports/notifications/email.py	80.00%	1 Missing ⚠️
superset/reports/notifications/slack.py	85.71%	1 Missing ⚠️
superset/utils/core.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #27497      +/-   ##
==========================================
+ Coverage   67.37%   69.72%   +2.34%     
==========================================
  Files        1909     1910       +1     
  Lines       74694    74736      +42     
  Branches     8326     8324       -2     
==========================================
+ Hits        50323    52107    +1784     
+ Misses      22321    20580    -1741     
+ Partials     2050     2049       -1     

Flag	Coverage Δ
hive	53.68% <32.14%> (?)
javascript	57.22% <77.77%> (+<0.01%)	⬆️
mysql	77.97% <55.35%> (-0.02%)	⬇️
postgres	78.07% <55.35%> (-0.05%)	⬇️
presto	53.63% <32.14%> (?)
python	83.10% <55.35%> (+4.84%)	⬆️
sqlite	77.52% <55.35%> (-0.05%)	⬇️
unit	56.58% <26.78%> (?)

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[eschutho]

Thanks @fisjac, this looks really great! LGTM!

[Shah-Panam]

In which version will this feature be available?

[eschutho]

@Shah-Panam This feature will go into the 4.1 release in/around May.

[Shah-Panam]

@eschutho Thanks for letting me know.