Rust: Avoid malformed parser fixture in code scanning

The nightly extractor currently panics when it indexes an intentionally malformed ra_ap_parser fixture. Remove only that fixture from Cargo's downloaded source before autobuild so the remaining dependency sources are still analyzed.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 612c2b22-3121-4c83-9656-bb0f4abb2a8a

Author: paldepind

.github/workflows/rust-analysis.yml

@@ -57,6 +57,14 @@ jobs:
         languages: ${{ matrix.language }}
         config-file: ./.github/codeql/codeql-config.yml
 
+    - name: Remove malformed rust-analyzer parser fixture
+      shell: bash
+      run: |
+        cargo fetch
+        find "${CARGO_HOME:-$HOME/.cargo}/registry/src" \
+          -path '*/ra_ap_parser-0.0.352/test_data/lexer/err/incomplete_frontmatter_before_unicode.rs' \
+          -delete
+
     - name: Autobuild
       uses: github/codeql-action/autobuild@main