Fix settings page error messages

[Lukewh]

Done

• Updated settings page to work the same as listings page.
• Make error messages a little more friendly on both
• Drive-by: Updated eslintrc to remove linting warning

How to QA

• Visit the settings page for a snap without a description and or summary
• Try and update visibility
• ERRORS 🥳
• The changes made should not be reverted on the page

Issue / Card

Fixes #

Screenshots

[webteam-app]

Demo starting at https://snapcraft-io-4481.demos.haus

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c9088de) 68.41% compared to head (ebb00e1) 68.41%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4481   +/-   ##
=======================================
  Coverage   68.41%   68.41%           
=======================================
  Files         112      112           
  Lines        3581     3581           
  Branches      924      924           
=======================================
  Hits         2450     2450           
  Misses       1007     1007           
  Partials      124      124           

Flag	Coverage Δ
javascript	68.41% <ø> (ø)

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[steverydz]

LGTM 👍