fix: include all credentials in the duplicate credential hint

[hperl]

Previously, we only returned one conflicting credential type in the duplicate credential error. Now, we include all conflicting credential types.

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
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  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[aeneasr]

Looks like some tests are failing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.03%. Comparing base (696cc1b) to head (0f783f2).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3881      +/-   ##
==========================================
- Coverage   78.05%   78.03%   -0.03%     
==========================================
  Files         360      360              
  Lines       25241    25246       +5     
==========================================
- Hits        19703    19701       -2     
- Misses       4032     4037       +5     
- Partials     1506     1508       +2     

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