chore: remove PUBLIC_ROLE_LIKE_GAMMA deprecated config key

[dpgaspar]

SUMMARY

Completely removed PUBLIC_ROLE_LIKE_GAMMA config key from the code base.

ADDITIONAL INFORMATION

• Has associated issue: [2.0] Remove PUBLIC_ROLE_LIKE_GAMMA #18900
• 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 #19274 (7068306) into master (783168e) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 7068306 differs from pull request most recent head 77dadeb. Consider uploading reports for the commit 77dadeb to get more accurate results

@@            Coverage Diff             @@
##           master   #19274      +/-   ##
==========================================
- Coverage   66.57%   66.56%   -0.01%     
==========================================
  Files        1667     1667              
  Lines       64418    64415       -3     
  Branches     6503     6503              
==========================================
- Hits        42886    42881       -5     
- Misses      19849    19851       +2     
  Partials     1683     1683              

Flag	Coverage Δ
hive	52.70% <100.00%> (+<0.01%)	⬆️
mysql	81.57% <100.00%> (+<0.01%)	⬆️
postgres	81.60% <100.00%> (-0.01%)	⬇️
presto	52.54% <100.00%> (+<0.01%)	⬆️
python	82.02% <100.00%> (-0.01%)	⬇️
sqlite	81.38% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
superset/security/manager.py	95.10% <ø> (+0.37%)	⬆️
superset/views/core.py	75.87% <100.00%> (ø)
superset/reports/commands/log_prune.py	85.71% <0.00%> (-3.58%)	⬇️
superset/commands/importers/v1/utils.py	92.20% <0.00%> (-1.30%)	⬇️
superset/common/query_object.py	95.18% <0.00%> (-0.54%)	⬇️
superset/reports/commands/execute.py	91.14% <0.00%> (-0.37%)	⬇️

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[villebro]

LGTM 🔥