fix: adds missing webauthn authentication method

[NickUfer]

Related issue(s)

Fixes #1913

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
  confirm that I got green light (please contact
  security@ory.sh) from the maintainers to push
  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

[codecov]

Codecov Report

Merging #1914 (39871c8) into master (bf80e96) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1914      +/-   ##
==========================================
+ Coverage   75.19%   75.21%   +0.01%     
==========================================
  Files         292      292              
  Lines       15169    15169              
==========================================
+ Hits        11407    11409       +2     
+ Misses       2951     2950       -1     
+ Partials      811      810       -1     

Impacted Files	Coverage Δ
internal/testhelpers/e2e_server.go	89.56% <0.00%> (+1.73%)	⬆️

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