Add forklift to remaining jobs (#3236)

Add [forklift
caching](https://gitlab.parity.io/parity/infrastructure/ci_cd/forklift/forklift)
to remainig jobs

by .sh and .py scripts:
- cargo-check-each-crate x6 (`.gitlab/check-each-crate.py`)
- build-linux-stable (`polkadot/scripts/build-only-wasm.sh`)

by before_script:
- build-linux-substrate
- build-subkey-linux (with `.build-subkey` job)
- cargo-check-benches x2

**To disable feature set FORKLIFT_BYPASS variable to true in [project
settings in
gitlab](https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/settings/ci_cd)**
(forklift now handles FORKLIFT_BYPASS by itself)

.gitlab/pipeline/test.yml

@@ -224,6 +224,7 @@ cargo-check-benches:
       git merge --verbose --no-edit FETCH_HEAD;
       fi
       fi'
+    - !reference [.forklift-cache, before_script]
   parallel: 2
   script:
     - mkdir -p ./artifacts/benches/$CI_COMMIT_REF_NAME-$CI_COMMIT_SHORT_SHA