Drop support for cursors #6482

Job	Run time
rust-check-git-rev-deps	18s
fmt	16s
build (gcc, current)	1h 13m 35s
cargo-deny (advisories)	39s
build (gcc, current, --check-test-tx-meta)	56m 45s
cargo-deny (bans licenses sources)	39s
build (gcc, next)	1h 35m 31s
build (gcc, next, --check-test-tx-meta)	58m 35s
build (clang, current)	55m 6s
build (clang, current, --check-test-tx-meta)	49m 58s
build (clang, next)	57m 34s
build (clang, next, --check-test-tx-meta)	50m 24s
complete	1s
	8h 19m 21s

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