fix(auth): Update exception handling for devices that don't support passkeys

[mattcreaser]

• PR title and description conform to Pull Request guidelines.

Issue #, if available:

Description of changes:
If CredentialManager tells us a device doesn't support passkeys then throw a WebAuthnNotSupportedException instead of general WebAuthnException.
Added unit tests.

How did you test these changes?
Unit tests
Replicate on pre-Android 28 device

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 42.01%. Comparing base (ed8389b) to head (c43f90b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3044      +/-   ##
==========================================
+ Coverage   41.96%   42.01%   +0.05%     
==========================================
  Files         992      992              
  Lines       31542    31546       +4     
  Branches     4645     4648       +3     
==========================================
+ Hits        13237    13255      +18     
+ Misses      16860    16830      -30     
- Partials     1445     1461      +16     

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