fix(alert/report): add notification method in alert report modal

[lilykuang]

SUMMARY

There was an issue related to add notification method button not showing up.

• fix add notification method button
• update test

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

After:
https://www.loom.com/share/5f7c6c295d5c4eeb8486f8842dd10cfd

TEST PLAN

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #13463 (5620a21) into master (6026e7d) will increase coverage by 0.85%.
The diff coverage is 79.41%.

@@            Coverage Diff             @@
##           master   #13463      +/-   ##
==========================================
+ Coverage   72.74%   73.60%   +0.85%     
==========================================
  Files         906      605     -301     
  Lines       45654    21266   -24388     
  Branches     5516     5523       +7     
==========================================
- Hits        33212    15653   -17559     
+ Misses      12232     5486    -6746     
+ Partials      210      127      -83     

Flag	Coverage Δ
cypress	57.94% <84.21%> (?)
hive	?
javascript	63.52% <73.52%> (+0.12%)	⬆️
mysql	?
postgres	?
presto	?
python	?
sqlite	?

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

Impacted Files	Coverage Δ
...dashboard/components/menu/MarkdownModeDropdown.tsx	87.50% <50.00%> (ø)
...frontend/src/views/CRUD/alert/AlertReportModal.tsx	62.52% <50.00%> (+6.52%)	⬆️
...hboard/components/menu/BackgroundStyleDropdown.tsx	91.66% <75.00%> (ø)
.../src/dashboard/components/menu/PopoverDropdown.tsx	70.37% <77.77%> (ø)
.../src/dashboard/components/menu/WithPopoverMenu.tsx	86.79% <91.66%> (ø)
...ontend/src/dashboard/components/menu/HoverMenu.tsx	100.00% <100.00%> (ø)
superset-frontend/src/views/routes.tsx	56.81% <0.00%> (-6.82%)	⬇️
...ore/components/DatasourcePanel/DatasourcePanel.tsx	75.86% <0.00%> (-2.71%)	⬇️
...-frontend/src/datasource/ChangeDatasourceModal.tsx	84.33% <0.00%> (-1.03%)	⬇️
...t-frontend/src/views/CRUD/welcome/SavedQueries.tsx	62.50% <0.00%> (-0.66%)	⬇️
... and 506 more

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