[WebCrypto] fix ml-kem/ml-dsa CryptoKey serialization

Add a new tag for key serialization (kNoParamsWithKeyTypeKeyTag) so that
no code modification is needed for serialization of new algorithms with
no key parameters. Use this to fix ML-KEM and ML-DSA key
serialization/deserialization, and change ChaCha20-Poly1305
serialization to use the new tag as well.

It would be nice to get rid of the Ed25519/X25519 specific
CryptoKeySubTags, but removing those would break currently serialized
Ed25519/X25519 tags.

Bug: 512509718
Change-Id: If37e0a11af116c9c1bb56f4c21bf4cf78e37b0e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7846315
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Hubert Chao <hchao@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1631817}
NOKEYCHECK=True
GitOrigin-RevId: 23479ab6594302233dc8e96fc027a102c9cbaef3