tests: Multiple available Digest Auth strategies + Opting-in to a strategy

[deve-sh]

Adds integration tests for #1524

[deve-sh]

Clarification: We're opting-in to the available strategies from the get-go

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.89%. Comparing base (ac7c7fd) to head (73c8bf7).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1531   +/-   ##
========================================
  Coverage    41.89%   41.89%           
========================================
  Files           49       49           
  Lines         3790     3790           
  Branches      1085     1085           
========================================
  Hits          1588     1588           
  Misses        2078     2078           
  Partials       124      124           

Flag	Coverage Δ
unit	41.89% <ø> (ø)

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