Drop support for cursors (#4580) #6484

Job	Run time
rust-check-git-rev-deps	19s
cargo-deny (advisories)	54s
fmt	13s
build (gcc, current)	1h 17m 2s
cargo-deny (bans licenses sources)	50s
build (gcc, current, --check-test-tx-meta)	55m 22s
build (gcc, next)	1h 19m 2s
build (gcc, next, --check-test-tx-meta)	57m 49s
build (clang, current)	59m 33s
build (clang, current, --check-test-tx-meta)	51m 59s
build (clang, next)	59m 46s
build (clang, next, --check-test-tx-meta)	51m 23s
complete	1s
	8h 14m 13s

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