Drop support for cursors #6444

Job	Run time
fmt	21s
build (gcc, current)	1m 59s
rust-check-git-rev-deps	16s
build (gcc, current, --check-test-tx-meta)	1m 47s
cargo-deny (advisories)	42s
build (gcc, next)	1m 52s
cargo-deny (bans licenses sources)	51s
build (gcc, next, --check-test-tx-meta)	1m 46s
build (clang, current)	1m 54s
build (clang, current, --check-test-tx-meta)	2m 15s
build (clang, next)	2m 7s
build (clang, next, --check-test-tx-meta)	1m 53s
complete	1s
	17m 44s

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