ci: drop unnecessary if guards and add continue-on-error to clean steps

Remove the `if: matrix.os != 'macos-latest'` condition from the clean
steps in test.yaml and clippy.yaml since it's unnecessary, and add
`continue-on-error: true` to all clean steps so a failure doesn't
fail the CI.

https://claude.ai/code/session_014NgdhJMEQSguQ8yXAuTfnq

Author: claude

.github/workflows/benchmark.yaml

@@ -117,5 +117,6 @@ jobs:
         run: node ci/github-actions/check-for-performance-regressions.js
 
       - name: Clean workspace artifacts before cache
+        continue-on-error: true
         shell: bash
         run: cargo clean --workspace

.github/workflows/clippy.yaml

@@ -60,6 +60,6 @@ jobs:
         run: ./test.sh
 
       - name: Clean workspace artifacts before cache
-        if: matrix.os != 'macos-latest'
+        continue-on-error: true
         shell: bash
         run: cargo clean --workspace

.github/workflows/deploy.yaml

@@ -618,5 +618,6 @@ jobs:
           asset_content_type: application/x-compressed-tar
 
       - name: Clean workspace artifacts before cache
+        continue-on-error: true
         shell: bash
         run: cargo clean --workspace

.github/workflows/test.yaml

@@ -75,6 +75,6 @@ jobs:
         run: ./test.sh --release
 
       - name: Clean workspace artifacts before cache
-        if: matrix.os != 'macos-latest'
+        continue-on-error: true
         shell: bash
         run: cargo clean --workspace