Remove `xilem_web_core` artifacts #1648

Job	Run time
cargo check (msrv) (wasm32)	17s
cargo check (msrv) (windows-latest)	1m 29s
cargo check (aarch64-android)	25s
cargo check (msrv) (macos-latest)	29s
cargo clippy (windows-latest)	2m 36s
cargo check (msrv) (ubuntu-latest)	33s
cargo clippy (wasm32)	1m 7s
cargo doc	1m 23s
cargo clippy (macos-latest)	1m 6s
formatting	29s
cargo clippy (ubuntu-latest)	1m 35s
Prime LFS Cache	4s
cargo test (wasm32)	19s
typos	5s
cargo test (windows-latest)	3m 19s
cargo test (macos-latest)	1m 53s
cargo test (ubuntu-latest)	3m 30s
	20m 39s

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