Switch to using `wkg` for most WIT vendoring #35228

Job	Run time
Determine CI jobs to run	21s
Clang format	12s
Clippy	6m 34s
Check JS	12s
Monolith Checks	3m 13s
Rustfmt	26s
Check wasmtime-fiber	41s
Check wasmtime-bench-api	1m 37s
Check wasmtime-cli	5m 38s
Check wasmtime	5m 39s
Check cranelift-entity	28s
Check wasmtime-wizer	2m 1s
Check wasmtime-c-api	1m 22s
Check cranelift-codegen	1m 13s
Check wasmtime-wasi	1m 46s
Check wasmtime-wasi-http	1m 3s
Test Linux x86_64 (2/6)	6m 48s
Test Linux x86_64 (wasmtime-wasi)	5m 53s
Test Linux x86_64 (wasmtime)	2m 33s
Test Linux x86_64 (wasmtime-cli)	12m 26s
Test Linux x86_64 (3/6)	8m 54s
Test C-API ${{ matrix.name }}	0s
Release build for ${{ matrix.build }}	0s
Test Linux x86_64 (1/6)	5m 14s
Cargo deny	0s
Test wasi-tls using native-tls & openssl providers	0s
Platform: ${{ matrix.target }}	0s
Cargo vet	0s
verify-publish	0s
Run benchmarks	0s
Meta deterministic check	0s
One-off special tests	0s
Doc build	0s
Test wasi-nn (${{ matrix.feature }}, ${{ matrix.os }})	0s
Build wasi-preview1-component-adapter	0s
Nightly tests	0s
Miri	0s
Test the min-platform example	0s
Test DWARF debugging	0s
Test wasmtime-fuzzing	0s
Cargo vet failed on a Pull Request	0s
Build wasi-preview1-component-adapter-provider	0s
Record the result of testing and building steps	2s
push-tag	-1s
File an issue if this build failed and was cron-triggered	-1s
	1h 14m 14s

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