Drop support for cursors #6451

Job	Run time
rust-check-git-rev-deps	18s
cargo-deny (advisories)	41s
build (gcc, current)	1h 22m 31s
cargo-deny (bans licenses sources)	56s
fmt	15s
build (gcc, current, --check-test-tx-meta)	58m 36s
build (gcc, next)	1h 20m 48s
build (gcc, next, --check-test-tx-meta)	56m 58s
build (clang, current)	56m 47s
build (clang, current, --check-test-tx-meta)	49m 23s
build (clang, next)	57m 58s
build (clang, next, --check-test-tx-meta)	51m 41s
complete	1s
	8h 16m 53s

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