feat(api/v2): implement U2F session check

[muhlemmer]

This change adds U2F support to the new (v2alpha) Session API. As the WebAuthN mechanism is the same as passkeys, the API is refactored to accommodate both U2F and Passkey use-cases with the same API Request message format.

The requested challenges are now message type, instead of a repeated enum. RequestChallenges can be used to obtain a WebAuthN challenge, with the needed parameters such as domain and user_verification_requirement.

• domain was moved out of the CreateSessionRequest as it is only needed for WebAuthN
• user_verification_requirement controls if the WebAuthN is a passkey or U2F level verification.

Updates #5477

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Name	Status	Preview	Comments	Updated (UTC)
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[codecov]

Codecov Report

Merging #6339 (fde32f8) into main (cd5e176) will increase coverage by 0.18%.
Report is 51 commits behind head on main.
The diff coverage is 55.29%.

@@            Coverage Diff             @@
##             main    #6339      +/-   ##
==========================================
+ Coverage   49.95%   50.13%   +0.18%     
==========================================
  Files        1232     1238       +6     
  Lines      110330   111727    +1397     
==========================================
+ Hits        55110    56015     +905     
- Misses      52556    53001     +445     
- Partials     2664     2711      +47     

Flag	Coverage Δ
core-integration-tests-postgres	24.03% <39.53%> (+0.41%)	⬆️
core-unit-tests	45.67% <41.14%> (+0.14%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
cmd/setup/03.go	0.00% <ø> (ø)
internal/api/grpc/admin/custom_text.go	0.00% <0.00%> (ø)
internal/api/grpc/admin/custom_text_converter.go	0.00% <0.00%> (ø)
internal/api/grpc/admin/export.go	0.00% <0.00%> (ø)
internal/api/grpc/admin/iam_settings_converter.go	0.00% <0.00%> (ø)
internal/api/grpc/admin/import.go	0.00% <0.00%> (ø)
internal/api/grpc/admin/org.go	0.00% <0.00%> (ø)
internal/api/grpc/auth/multi_factor.go	0.00% <0.00%> (ø)
internal/api/grpc/management/custom_text.go	0.00% <0.00%> (ø)
...ernal/api/grpc/management/custom_text_converter.go	0.00% <0.00%> (ø)
... and 95 more

... and 40 files with indirect coverage changes

[github-actions]

🎉 This PR is included in version 2.33.0 🎉

The release is available on GitHub release

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