feat: Convert ENABLE_BROAD_ACTIVITY_ACCESS and MENU_HIDE_USER_INFO into feature flags

[michael-s-molina]

SUMMARY

Converts ENABLE_BROAD_ACTIVITY_ACCESS and MENU_HIDE_USER_INFO into feature flags as part of the 3.0 cleanup efforts.

ENABLE_BROAD_ACTIVITY_ACCESS had its default value altered to False as it's more secure.

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

[codecov]

Codecov Report

Merging #24345 (407414b) into master (e0253a4) will decrease coverage by 0.13%.
The diff coverage is 88.88%.

❗ Current head 407414b differs from pull request most recent head 6081069. Consider uploading reports for the commit 6081069 to get more accurate results

@@            Coverage Diff             @@
##           master   #24345      +/-   ##
==========================================
- Coverage   69.04%   68.91%   -0.13%     
==========================================
  Files        1903     1903              
  Lines       74564    74558       -6     
  Branches     8107     8107              
==========================================
- Hits        51485    51385     -100     
- Misses      20968    21062      +94     
  Partials     2111     2111              

Flag	Coverage Δ
hive	?
javascript	55.61% <100.00%> (-0.01%)	⬇️
mysql	79.35% <85.71%> (?)
postgres	79.42% <85.71%> (+<0.01%)	⬆️
presto	?
python	83.04% <85.71%> (-0.27%)	⬇️
sqlite	77.94% <71.42%> (-0.01%)	⬇️
unit	54.20% <28.57%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...ackages/superset-ui-core/src/utils/featureFlags.ts	100.00% <ø> (ø)
superset/config.py	91.93% <ø> (-0.05%)	⬇️
superset/views/base.py	77.21% <ø> (ø)
superset/views/core.py	75.68% <ø> (+0.25%)	⬆️
superset/models/filter_set.py	77.27% <50.00%> (-0.34%)	⬇️
superset-frontend/src/pages/ChartList/index.tsx	55.00% <100.00%> (-0.32%)	⬇️
...uperset-frontend/src/pages/DashboardList/index.tsx	55.37% <100.00%> (-0.37%)	⬇️
superset/connectors/sqla/models.py	88.65% <100.00%> (-0.99%)	⬇️
superset/models/dashboard.py	78.92% <100.00%> (-0.09%)	⬇️
superset/models/slice.py	87.73% <100.00%> (-0.06%)	⬇️
... and 1 more

... and 9 files with indirect coverage changes

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