Add Missing Specs for REST API Middleware

[alexanderkiel]

Closes: #4164

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.57%. Comparing base (6b51ca0) to head (3ab11a3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4169   +/-   ##
=======================================
  Coverage   96.56%   96.57%           
=======================================
  Files         442      442           
  Lines       28218    28224    +6     
  Branches      659      657    -2     
=======================================
+ Hits        27249    27256    +7     
  Misses        465      465           
+ Partials      504      503    -1     

Files with missing lines	Coverage Δ
...t-api/src/blaze/rest_api/middleware/auth_guard.clj	100.00% <100.00%> (ø)
...es/rest-util/src/blaze/middleware/fhir/db_spec.clj	100.00% <100.00%> (ø)
...est-util/src/blaze/middleware/fhir/output_spec.clj	100.00% <100.00%> (ø)
...t-util/src/blaze/middleware/fhir/resource_spec.clj	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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