refactor: Removes legacy dashboard endpoints

[michael-s-molina]

SUMMARY

As part of the 5.0 proposals, this PR executes the 92 - Remove old Dashboard views and endpoints.

I didn't add anything to UPDATING.md given that the removed endpoint was not under api/v1.

TESTING INSTRUCTIONS

CI should be sufficient.

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

[korbit-ai]

I've completed my review and didn't find any issues.

Files scanned

​

File Path	Reviewed
superset/views/dashboard/views.py	✅
superset/initialization/init.py	✅

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.46%. Comparing base (76d897e) to head (83b2ec3).
Report is 1344 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #31943       +/-   ##
===========================================
+ Coverage   60.48%   83.46%   +22.97%     
===========================================
  Files        1931      546     -1385     
  Lines       76236    39249    -36987     
  Branches     8568        0     -8568     
===========================================
- Hits        46114    32759    -13355     
+ Misses      28017     6490    -21527     
+ Partials     2105        0     -2105     

Flag	Coverage Δ
hive	48.78% <100.00%> (-0.38%)	⬇️
javascript	?
mysql	75.98% <100.00%> (?)
postgres	76.05% <100.00%> (?)
presto	53.28% <100.00%> (-0.52%)	⬇️
python	83.46% <100.00%> (+19.97%)	⬆️
sqlite	75.52% <100.00%> (?)
unit	61.07% <100.00%> (+3.44%)	⬆️

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