chore: remove code deprecated in 2.0

[lilykuang]

SUMMARY

• remove code deprecated in 2.0 or earlier
• #22022

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

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 #24126 (9df7458) into master (6dba6e3) will increase coverage by 10.14%.
The diff coverage is n/a.

❗ Current head 9df7458 differs from pull request most recent head 2b3d969. Consider uploading reports for the commit 2b3d969 to get more accurate results

@@             Coverage Diff             @@
##           master   #24126       +/-   ##
===========================================
+ Coverage   58.16%   68.30%   +10.14%     
===========================================
  Files        1901     1957       +56     
  Lines       74000    75485     +1485     
  Branches     8116     8223      +107     
===========================================
+ Hits        43043    51561     +8518     
+ Misses      28846    21817     -7029     
+ Partials     2111     2107        -4     

Flag	Coverage Δ
hive	53.47% <ø> (-0.46%)	⬇️
mysql	78.94% <ø> (?)
postgres	79.01% <ø> (?)
presto	53.40% <ø> (-0.44%)	⬇️
python	82.85% <ø> (+21.96%)	⬆️
sqlite	77.55% <ø> (?)
unit	53.53% <ø> (-1.10%)	⬇️

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

Impacted Files	Coverage Δ
superset/views/core.py	76.09% <ø> (+43.34%)	⬆️

... and 508 files with indirect coverage changes

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[rusackas]

Is any of this considered a breaking change? If so, we'd need the risk:breaking-change label, and an entry in UPDATING.md