zcash_client_backend: Require the tree state for the start of each sc… #2623

Job	Run time
Bitrot check	2m 46s
Build target wasm32-wasi	2m 40s
Check ZFuture build on Linux	3m 52s
Latest build on ubuntu-latest	1m 31s
Check ZFuture build on macOS	4m 0s
Latest build on windows-latest	3m 21s
Clippy (MSRV)	3m 18s
Check ZFuture build on Windows	5m 27s
Latest build on macOS-latest	3m 40s
Clippy (beta)	12s
Code coverage	18m 25s
Rustfmt	13s
Intra-doc links	3m 53s
protobuf consistency	2m 58s
UUID validity	8s
Test on Linux	1s
Test Orchard on Linux	1s
Test NU6 on Linux	1s
Test on macOS	11m 22s
Test Orchard on macOS	11m 42s
Test on Windows	1s
Test Orchard on Windows	1s
Test NU6 on Windows	1s
	1h 19m 34s

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