Fix defects related to Passkey 3.0 Hints

[Tyrrrz]

Ticket

• https://bitwarden.atlassian.net/browse/PAS-549
• https://bitwarden.atlassian.net/browse/PAS-550
• https://bitwarden.atlassian.net/browse/PAS-551

Description

Shape

Screenshots

Checklist

I did the following to ensure that my changes were tested thoroughly:

• __

I did the following to ensure that my changes do not introduce security vulnerabilities:

• __

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

Project coverage is 34.85%. Comparing base (fc4ca17) to head (504daea).

Files	Patch %	Lines
...tionConfiguration/CredentialHintStringAttribute.cs	0.00%	14 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #668 +/- ## ========================================== - Coverage 34.86% 34.85% -0.02% ========================================== Files 565 565 Lines 30934 30944 +10 Branches 921 924 +3 ========================================== Hits 10785 10785 - Misses 20007 20017 +10 Partials 142 142 ```

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