v2: Switch vegafusion-wasm to use vega-embed, drop vegafusion-embed #1009

Job	Run time
build-vegafusion-python-osx-64	20m 31s
build-vegafusion-python-linux-64	15m 17s
build-vegafusion-python-osx-arm64	17m 10s
build-vegafusion-python-linux-arm64	15m 53s
build-vegafusion-python-win-64	32m 11s
build-vegafusion-server-osx-64	29m 23s
build-vegafusion-server-linux-64	12m 46s
build-vegafusion-server-linux-arm64	14m 24s
build-vegafusion-server-osx-arm64	12m 11s
build-vegafusion-server-win-64	29m 59s
build-vegafusion-wasm	11m 45s
check-rust	7m 39s
check-vegafusion-python	11m 1s
test-rust (ubuntu-20.04)	23m 6s
test-rust (windows-2022)	43m 53s
test-rust (macos-14)	25m 8s
test-vegafusion-python-linux-64	26m 10s
test-vegafusion-python-osx-arm64	1m 2s
test-vegafusion-python-win-64	2m 4s
	5h 51m 33s

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