op_store: add metadata flag for ops representing working-copy snapshot #9296

Job	Run time
build (ubuntu-latest)	3m 4s
Check protos	26s
Check that MkDocs can build the docs	25s
build (macos-14)	2m 27s
Check that MkDocs can build the docs with Poetry 1.3.2	32s
build (windows-latest)	6m 49s
build (ubuntu-latest, --all-features)	4m 1s
cargo-deny (advisories)	26s
cargo-deny (bans licenses sources)	22s
Clippy check	2m 34s
Check formatting	14s
	21m 20s

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