Better behavior for inactive users

[amstilp]

• Show alerts on the user profile page if 1) the user is inactive or 2) the user's linked account is inactive
• Hide inactive users in the user autocomplete view
• Do not allow user lookups for inactive users (but you can still manually navigate to their profile page)

and a couple other misc updates:

• make the alert about linking your account dismissible

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.00%. Comparing base (8cd1f94) to head (25bda17).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #674   +/-   ##
=======================================
  Coverage   99.00%   99.00%           
=======================================
  Files         325      325           
  Lines       30411    30482   +71     
=======================================
+ Hits        30109    30180   +71     
  Misses        302      302           

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