fix: roles undefined on public dashboards

[suddjian]

SUMMARY

Fix for public dashboards where there is no user (but redux still has a "user" which is just an empty object)

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

Set PUBLIC_ROLE_LIKE config value to a role that can view dashboards, and view a dashboard as an anonymous user. It should show up.

ADDITIONAL INFORMATION

• Has associated issue: Public dashboard does not work due to JS error in findPermission.ts #14442
• 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

[pkdotson]

lgtm

[codecov]

Codecov Report

Merging #14648 (aa0e09e) into master (f16c708) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #14648   +/-   ##
=======================================
  Coverage   77.37%   77.37%           
=======================================
  Files         958      958           
  Lines       48513    48513           
  Branches     5703     5703           
=======================================
  Hits        37535    37535           
  Misses      10777    10777           
  Partials      201      201           

Flag	Coverage Δ
hive	80.94% <ø> (ø)
javascript	72.51% <100.00%> (ø)
mysql	81.21% <ø> (ø)
postgres	81.23% <ø> (ø)
python	81.60% <ø> (ø)
sqlite	80.85% <ø> (ø)

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

Impacted Files	Coverage Δ
...rset-frontend/src/dashboard/util/findPermission.ts	100.00% <100.00%> (ø)

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