Do not allow publishing with default readme #11359

Job	Run time
rustfmt	18s
lint-build	55s
test-wasm	1m 25s
test (stable, x86_64-apple-darwin)	7m 44s
validate	22s
test (stable, x86_64-unknown-linux-gnu)	4m 21s
test (stable, x86_64-unknown-linux-musl)	5m 30s
test (stable, aarch64-apple-darwin, macos-latest, arm64, cargo, true)	5m 58s
test (stable, aarch64-unknown-linux-gnu)	3m 44s
test (stable, aarch64-unknown-linux-musl)	4m 12s
test (stable, x86_64-pc-windows-msvc)	5m 22s
test-projects	2m 26s
	42m 17s

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