feat: support user topics when handling custom operation #6586

Job	Run time
Block fixup commits	29s
Check whether Cargo.lock is up to date	27s
Filter changes	6s
Shellcheck	8s
Spell Check with Typos	6s
Run format checks	5m 12s
Run cargo clippy	58s
Run cargo test	7m 51s
Run cargo check on MSRV	43s
Run cargo audit	19s
Sort dependencies	2m 11s
nightly / doc	45s
Check for unused dependencies	6m 51s
Check markdown	0s
	26m 6s

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