refactor: use GROUP variable for artifact names instead of sanitizing NAME

Add a GROUP matrix variable to valgrind and sanitizer test configurations
with simple numeric values. Use matrix.GROUP in artifact names instead of
sanitizing the descriptive NAME, which contains special characters.

This is cleaner and more maintainable than string replacement logic.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Author: cdecker

.github/workflows/ci.yaml

@@ -461,24 +461,34 @@ jobs:
       matrix:
         include:
           - NAME: Valgrind (01/10)
+            GROUP: 1
             PYTEST_OPTS: --test-group=1  --test-group-count=10
           - NAME: Valgrind (02/10)
+            GROUP: 2
             PYTEST_OPTS: --test-group=2  --test-group-count=10
           - NAME: Valgrind (03/10)
+            GROUP: 3
             PYTEST_OPTS: --test-group=3  --test-group-count=10
           - NAME: Valgrind (04/10)
+            GROUP: 4
             PYTEST_OPTS: --test-group=4  --test-group-count=10
           - NAME: Valgrind (05/10)
+            GROUP: 5
             PYTEST_OPTS: --test-group=5  --test-group-count=10
           - NAME: Valgrind (06/10)
+            GROUP: 6
             PYTEST_OPTS: --test-group=6  --test-group-count=10
           - NAME: Valgrind (07/10)
+            GROUP: 7
             PYTEST_OPTS: --test-group=7  --test-group-count=10
           - NAME: Valgrind (08/10)
+            GROUP: 8
             PYTEST_OPTS: --test-group=8  --test-group-count=10
           - NAME: Valgrind (09/10)
+            GROUP: 9
             PYTEST_OPTS: --test-group=9  --test-group-count=10
           - NAME: Valgrind (10/10)
+            GROUP: 10
             PYTEST_OPTS: --test-group=10 --test-group-count=10
     steps:
       - name: Checkout
@@ -519,7 +529,7 @@ jobs:
         if: always()
         uses: actions/upload-artifact@v4
         with:
-          name: pytest-results-integration-valgrind-${{ replace(replace(replace(matrix.NAME, '/', '-'), '(', '-'), ')', '') }}
+          name: pytest-results-integration-valgrind-${{ matrix.GROUP }}
           path: report.xml
           if-no-files-found: ignore
 
@@ -539,28 +549,40 @@ jobs:
       matrix:
         include:
           - NAME: ASan/UBSan (01/12)
+            GROUP: 1
             PYTEST_OPTS: --test-group=1  --test-group-count=12
           - NAME: ASan/UBSan (02/12)
+            GROUP: 2
             PYTEST_OPTS: --test-group=2  --test-group-count=12 -n 1
           - NAME: ASan/UBSan (03/12)
+            GROUP: 3
             PYTEST_OPTS: --test-group=3  --test-group-count=12
           - NAME: ASan/UBSan (04/12)
+            GROUP: 4
             PYTEST_OPTS: --test-group=4  --test-group-count=12
           - NAME: ASan/UBSan (05/12)
+            GROUP: 5
             PYTEST_OPTS: --test-group=5  --test-group-count=12
           - NAME: ASan/UBSan (06/12)
+            GROUP: 6
             PYTEST_OPTS: --test-group=6  --test-group-count=12
           - NAME: ASan/UBSan (07/12)
+            GROUP: 7
             PYTEST_OPTS: --test-group=7  --test-group-count=12
           - NAME: ASan/UBSan (08/12)
+            GROUP: 8
             PYTEST_OPTS: --test-group=8  --test-group-count=12
           - NAME: ASan/UBSan (09/12)
+            GROUP: 9
             PYTEST_OPTS: --test-group=9  --test-group-count=12
           - NAME: ASan/UBSan (10/12)
+            GROUP: 10
             PYTEST_OPTS: --test-group=10 --test-group-count=12
           - NAME: ASan/UBSan (11/12)
+            GROUP: 11
             PYTEST_OPTS: --test-group=11 --test-group-count=12
           - NAME: ASan/UBSan (12/12)
+            GROUP: 12
             PYTEST_OPTS: --test-group=12 --test-group-count=12
     steps:
       - name: Checkout
@@ -596,7 +618,7 @@ jobs:
         if: always()
         uses: actions/upload-artifact@v4
         with:
-          name: pytest-results-integration-sanitizers-${{ replace(replace(replace(matrix.NAME, '/', '-'), '(', '-'), ')', '') }}
+          name: pytest-results-integration-sanitizers-${{ matrix.GROUP }}
           path: report.xml
           if-no-files-found: ignore