feat: (Explore) Pre-populate dashboard in Explore

[AAfghahi]

SUMMARY

This pre-populates the save to dashboard file if you came from an empty dashboard.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Screen.Recording.2022-05-06.at.4.02.47.PM.mov

TESTING INSTRUCTIONS

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 #19964 (ed88c67) into master (902ac05) will increase coverage by 0.01%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master   #19964      +/-   ##
==========================================
+ Coverage   66.27%   66.29%   +0.01%     
==========================================
  Files        1712     1712              
  Lines       63957    63970      +13     
  Branches     6720     6734      +14     
==========================================
+ Hits        42390    42407      +17     
+ Misses      19859    19849      -10     
- Partials     1708     1714       +6     

Flag	Coverage Δ
javascript	51.29% <75.00%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
...rontend/src/dashboard/containers/DashboardGrid.jsx	100.00% <ø> (ø)
...rontend/src/dashboard/components/DashboardGrid.jsx	63.15% <50.00%> (+0.65%)	⬆️
...rset-frontend/src/explore/components/SaveModal.tsx	66.23% <75.00%> (+0.03%)	⬆️
...perset-frontend/src/addSlice/AddSliceContainer.tsx	64.10% <83.33%> (+2.33%)	⬆️
...uperset-frontend/src/utils/getClientErrorObject.ts	63.15% <0.00%> (-8.28%)	⬇️
...nts/ExploreAdditionalActionsMenu/ExploreReport.tsx	50.00% <0.00%> (-7.90%)	⬇️
superset-frontend/src/reports/actions/reports.js	36.36% <0.00%> (-3.04%)	⬇️
...-frontend/src/components/CopyToClipboard/index.jsx	96.00% <0.00%> (ø)
...frontend/src/dashboard/components/Header/index.jsx	60.92% <0.00%> (ø)
...nd/src/dashboard/components/gridComponents/Tab.jsx	83.67% <0.00%> (ø)
... and 10 more

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[yousoph]

/testenv up FEATURE_ALERT_REPORTS=True

[github-actions]

@yousoph Ephemeral environment spinning up at http://35.89.175.233:8080. Credentials are admin/admin. Please allow several minutes for bootstrapping and startup.

[AAfghahi]

similar functionality added here: #20129 so closing this PR in favor of their solution.

[github-actions]

Ephemeral environment shutdown and build artifacts deleted.