Check is a user is disabled before logging in

[shiv-tyagi]

As discussed in #640, this adds a property to the UserDB to mark a user enable/disabled. Before creating an authentication session in pam, we check if the user exists in the cache and is disabled.

[shiv-tyagi]

@adombeck Does this look good?

I see that the tests are failing on main branch as well. So I am hoping that it is not me.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.

Project coverage is 83.16%. Comparing base (36511cd) to head (fed3921).
Report is 323 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/services/pam/pam.go	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #782      +/-   ##
==========================================
- Coverage   83.43%   83.16%   -0.28%     
==========================================
  Files          83       96      +13     
  Lines        8689     9646     +957     
  Branches       74       74              
==========================================
+ Hits         7250     8022     +772     
- Misses       1111     1243     +132     
- Partials      328      381      +53     

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