fix: update `in_contract` flag before handling function metadata in elaborator #10618

Job	Run time
build-apple-darwin (x86_64-apple-darwin)	4m 30s
build-apple-darwin (aarch64-apple-darwin)	4m 34s
build-linux (x86_64-unknown-linux-gnu)	2m 52s
build-linux (x86_64-unknown-linux-musl)	3m 5s
	15m 1s

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