zcash_client_backend: Post-merge cleanups to test framework extraction #5814

Job	Run time
Build target wasm32-wasi	58s
Check ZFuture build on Linux	25s
Bitrot check	1m 48s
Code coverage	18m 43s
Check ZFuture build on macOS	44s
Latest build on ubuntu-latest	2m 7s
Check ZFuture build on Windows	2m 1s
Latest build on windows-latest	5m 20s
Latest build on macOS-latest	1m 54s
Test on Linux	9m 13s
Clippy (MSRV)	1m 30s
Test Orchard on Linux	10m 57s
Clippy (beta)	12s
Test NU6 on Linux	9m 14s
Test on macOS	12m 7s
Intra-doc links	1m 59s
Test Orchard on macOS	13m 7s
Test on Windows	16m 32s
Rustfmt	16s
Test Orchard on Windows	18m 5s
UUID validity	3s
Test NU6 on Windows	18m 12s
protobuf consistency	1m 11s
	2h 26m 38s

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