Drop support for cursors #6445

Job	Run time
fmt	13s
rust-check-git-rev-deps	19s
cargo-deny (advisories)	50s
build (gcc, current)	1h 10m 38s
cargo-deny (bans licenses sources)	41s
build (gcc, current, --check-test-tx-meta)	56m 54s
build (gcc, next)	1h 9m 27s
build (gcc, next, --check-test-tx-meta)	59m 30s
build (clang, current)	59m 57s
build (clang, current, --check-test-tx-meta)	49m 57s
build (clang, next)	1h 2m 46s
build (clang, next, --check-test-tx-meta)	50m 44s
complete	1s
	8h 1m 57s

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