[WebCryptoAPI] Secure Curves have no namedCurve

[youennf]

8722815

[WebCryptoAPI] Secure Curves have no namedCurve
https://bugs.webkit.org/show_bug.cgi?id=252555
rdar://problem/105666277

Reviewed by Chris Dumez.

As per https://wicg.github.io/webcrypto-secure-curves/#ed25519-description, the key algorithm is a simple KeyAlgorithm.
Update code accordingly.
Covered by test change cherry-picked from WPT upstream.

* LayoutTests/imported/w3c/web-platform-tests/WebCryptoAPI/util/helpers.js:
(assert_goodCryptoKey):
* Source/WebCore/crypto/keys/CryptoKeyOKP.cpp:
(WebCore::CryptoKeyOKP::algorithm const):

Canonical link: https://commits.webkit.org/260599@main

da54f41

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[webkit-early-warning-system]

EWS run on current version of this PR (hash da54f41)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	❌ 🛠 wpe	🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🛠 gtk
✅ 🧪 webkitperl	🧪 ios-wk2	🧪 api-mac	🧪 gtk-wk2
	🧪 api-ios	✅ 🧪 mac-wk1	🧪 api-gtk
	✅ 🛠 tv	🧪 mac-wk2
	✅ 🛠 tv-sim	🧪 mac-AS-debug-wk2
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
✅ 🛠 🧪 merge	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 260599@main (8722815): https://commits.webkit.org/260599@main

Reviewed commits have been landed. Closing PR #10435 and removing active labels.