FI-3710: Auth info fixes

[Jammjammjamm]

Summary

This branch adds helper methods to make it easier to use AuthInfo, and also updates how inputs are merged so that individual AuthInfo components are merged rather than being clobbered when two AuthInfo inputs are merged.

Testing Guidance

These changes are best viewed when using the g10/us core/smart app launch AuthInfo update branches.

[codecov]

Codecov Report

Attention: Patch coverage is 82.85714% with 12 lines in your changes missing coverage. Please review.

Project coverage is 84.72%. Comparing base (c722314) to head (ac81cbe).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/inferno/dsl/auth_info.rb	52.17%	11 Missing ⚠️
lib/inferno/repositories/session_data.rb	50.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (82.85%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #602      +/-   ##
==========================================
- Coverage   84.74%   84.72%   -0.02%     
==========================================
  Files         283      283              
  Lines       12350    12415      +65     
  Branches     1478     1503      +25     
==========================================
+ Hits        10466    10519      +53     
- Misses       1876     1888      +12     
  Partials        8        8              

Flag	Coverage Δ
backend	92.32% <82.85%> (-0.14%)	⬇️
frontend	79.25% <ø> (ø)

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