Fix Windows CI cargo test silently passing (mimblewimble#603)

* Fix Windows CI

* move cargo clean to be consistent with node

Author: trevyn

.ci/test.yml

@@ -1,10 +1,9 @@
 steps:
-  - script: |
-      refreshenv
-      LIBCLANG_PATH=C:\Program Files\LLVM\lib
-      LLVM_CONFIG_PATH=C:\Program Files\LLVM\bin\llvm-config
-      ROARING_ARCH=x86-64-v2
-      cargo test --all
+  - script: 'refreshenv && cargo test --all'
+    env:
+      LIBCLANG_PATH: C:\Program Files\LLVM\lib
+      LLVM_CONFIG_PATH: C:\Program Files\LLVM\bin\llvm-config
+      ROARING_ARCH: x86-64-v2
     displayName: Windows Cargo Test
     condition: and(eq( variables['Agent.OS'], 'Windows_NT' ), eq( variables['CI_JOB'], 'test-all' ))
   - script: 'ROARING_ARCH=x86-64-v2 cargo test --all'

.ci/windows-release.yml

@@ -1,22 +1,16 @@
 steps:
-  - script: |
-      refreshenv
-      LIBCLANG_PATH=C:\Program Files\LLVM\lib
-      LLVM_CONFIG_PATH=C:\Program Files\LLVM\bin\llvm-config
-      ROARING_ARCH=x86-64-v2
-      cargo test --all
+  - script: 'refreshenv && cargo test --all'
+    env:
+      LIBCLANG_PATH: C:\Program Files\LLVM\lib
+      LLVM_CONFIG_PATH: C:\Program Files\LLVM\bin\llvm-config
+      ROARING_ARCH: x86-64-v2
     displayName: Cargo Test All
     condition:  and(succeeded(), contains(variables['Build.SourceBranch'], 'refs/tags/'), eq(variables['CI_JOB'], 'release' ))
-  - script: 'cargo clean'
-    displayName: Cargo Clean
-    condition:  and(succeeded(), contains(variables['Build.SourceBranch'], 'refs/tags/'), eq(variables['CI_JOB'], 'release' ))
-  - script: |
-      cargo clean
-      refreshenv
-      LIBCLANG_PATH=C:\Program Files\LLVM\lib
-      LLVM_CONFIG_PATH=C:\Program Files\LLVM\bin\llvm-config
-      ROARING_ARCH=x86-64-v2
-      cargo build --release
+  - script: 'refreshenv && cargo clean && cargo build --release'
+    env:
+      LIBCLANG_PATH: C:\Program Files\LLVM\lib
+      LLVM_CONFIG_PATH: C:\Program Files\LLVM\bin\llvm-config
+      ROARING_ARCH: x86-64-v2
     displayName: Build Release
     condition:  and(succeeded(), contains(variables['Build.SourceBranch'], 'refs/tags/'), eq(variables['CI_JOB'], 'release' ))
   - script: |