remove isPasskeyPlatformAuthenticatorAvailable()

[timcappalli]

This PR removes the isPasskeyPlatformAuthenticatorAvailable() method in favor of the getClientCapabilities() method defined in #1923.

See issue #1937 for additional context.

---

Preview | Diff

[ko-koiwai]

Do we need to keep the passkey definition if we don't use the word?

[Firstyear]

Do we need to keep the passkey definition if we don't use the word?

Agreed, it should be removed.

[maxhata]

If isPasskeyPlatformAuthenticatorAvailable() is going to be removed, we should also remove the definition of "passkey" that are recently introduced by the same PR1901, since "passkey" is not used in the specification after isPasskeyPlatformAuthenticatorAvailable() is removed.

https://w3c.github.io/webauthn/#passkey

Since the definition of "passkey" has a huge impact on marketing, we need to discuss with FIDO Alliance and make sure we have a consensus with their definition.

PR1901:
#1901

[Firstyear]

Since the definition of "passkey" has a huge impact on marketing, we need to discuss with FIDO Alliance and make sure we have a consensus with their definition.

we shouldn't have any marketing elements at all in a technical specification. It's previously been raised that there are at least 4 different definitions of what a passkey is depending on who's marketing team you ask.

[MasterKale]

Do we need to keep the passkey definition if we don't use the word?

PR #1923 gained a new passkeyPlatformAuthenticator capability that references the "passkey platform authenticator" alias that was added with the original isPasskeyPlatformAuthenticatorAvailable(), so it needs to persist.

[timcappalli]

Please keep the discussion on this PR, to the contents of this PR. This PR removes a method. Comments and feedback should be about that.

If you'd like to propose other changes, please create a pull request.

[emlun]

It is technically accurate that this PR in isolation will leave the "passkey" terms unused, but this PR should be considered in combination with PR #1923 which as currently written would add new text referencing the terms.

[ve7jtb]

lgtm

[MasterKale]

Ready to merge pending resolution of the merge conflict (@timcappalli)

[MasterKale]

I took care of the merge conflict so it should be good to merge.