chore(explore): remove unnecessary favstar redirect

[villebro]

SUMMARY

Remove an unnecessary 308 redirect for the /superset/favstar/slice/<pk>/count endpoint in the Explore view.

AFTER

Notice no redirects:

BEFORE

Notice the 308 redirect

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

[zhaoyongjie]

refer to:

Superset.favstar                                  GET        /superset/favstar/<class_name>/<int:obj_id>/<action>/

[zhaoyongjie]

LGTM

[codecov]

Codecov Report

Merging #16288 (9d5fd60) into master (3709131) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #16288      +/-   ##
==========================================
- Coverage   76.70%   76.69%   -0.01%     
==========================================
  Files         997      997              
  Lines       53240    53247       +7     
  Branches     6774     6777       +3     
==========================================
+ Hits        40838    40840       +2     
- Misses      12172    12177       +5     
  Partials      230      230              

Flag	Coverage Δ
javascript	70.94% <ø> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
...set-frontend/src/explore/actions/exploreActions.ts	36.20% <ø> (ø)
...et-frontend/src/components/TableView/TableView.tsx	94.44% <0.00%> (-1.34%)	⬇️
...rset-frontend/src/components/ReportModal/index.tsx	73.40% <0.00%> (-1.07%)	⬇️
...frontend/src/views/CRUD/alert/AlertReportModal.tsx	62.64% <0.00%> (-0.24%)	⬇️
superset-frontend/src/common/components/index.tsx	100.00% <0.00%> (ø)
superset-frontend/src/components/Select/Select.tsx	73.42% <0.00%> (+0.12%)	⬆️
...perset-frontend/src/addSlice/AddSliceContainer.tsx	56.92% <0.00%> (+0.25%)	⬆️

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