feat(alerts): enable tab selection for dashboard alerts/reports

[fisjac]

SUMMARY

Implements a new feature enabling a tab to be selected as a view for an alert/report. When a dashboard is selected as the content for a report, an antd TreeSelect component is rendered to load and select tab options. When selected, the tab selection is added to the report payload as an anchor.

On execution, the feature takes advantage of existing logic for the report.extra.dashboard.anchor_tab attribute of the ReportSchedule SQLA model. When extra metadata are attached to the report schedule, a permalink is generated with the metadata included, and this permalink is then used to generate screenshots of the selected dashboard.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags: ALERT_REPORTS, ALERT_REPORT_TABS
• 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 54.16667% with 11 lines in your changes missing coverage. Please review.

Project coverage is 61.19%. Comparing base (76d897e) to head (a86e642).
Report is 364 commits behind head on master.

Files	Patch %	Lines
...-frontend/src/features/alerts/AlertReportModal.tsx	57.14%	9 Missing ⚠️
...rontend/src/dashboard/containers/DashboardPage.tsx	0.00%	1 Missing ⚠️
superset/commands/report/execute.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #29096      +/-   ##
==========================================
+ Coverage   60.48%   61.19%   +0.70%     
==========================================
  Files        1931     1956      +25     
  Lines       76236    78396    +2160     
  Branches     8568     8951     +383     
==========================================
+ Hits        46114    47977    +1863     
- Misses      28017    28225     +208     
- Partials     2105     2194      +89     

Flag	Coverage Δ
hive	48.90% <50.00%> (-0.26%)	⬇️
javascript	58.01% <54.54%> (+0.29%)	⬆️
presto	53.51% <50.00%> (-0.30%)	⬇️
python	64.65% <50.00%> (+1.16%)	⬆️
unit	59.20% <50.00%> (+1.58%)	⬆️

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