fix: Multiple digest auth headers not filtered by opted algorithm

[deve-sh]

Works to fix postmanlabs/postman-app-support#13756

Context

Since servers can return multiple values for www-authenticate headers to present clients with multiple options, we need to filter the right header based on the auth.algorithm setting passed by postman-runtime's consumer.

[codecov]

Codecov Report

❌ Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 38.62%. Comparing base (92efc97) to head (439e2e2).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
lib/authorizer/digest.js	41.66%	6 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (41.66%) is below the target coverage (100.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1524      +/-   ##
===========================================
- Coverage    38.66%   38.62%   -0.05%     
===========================================
  Files           46       46              
  Lines         3525     3534       +9     
  Branches      1023     1026       +3     
===========================================
+ Hits          1363     1365       +2     
- Misses        2065     2071       +6     
- Partials        97       98       +1     

Flag	Coverage Δ
unit	38.62% <41.66%> (-0.05%)	⬇️

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[appurva21]

Logic looks good. Suggested some optional refactoring.

[appurva21]

Can we add tests for this?

[deve-sh]

I checked the digest auth server we run for our integration suite, that version of passport doesn't seem to support multiple digest auth headers as part of www-authenticate.

I'll check a little further and find another way to verify this change.

[appurva21]

Approved. Tests to be added.