Make copy and multipart test jobs fail instead of succeed

Changed exit 0 to exit 1 for s3-sse-copy-operations and s3-sse-multipart
jobs. These jobs document known limitations but should fail to ensure
the issues are tracked and addressed, not silently ignored.

.github/workflows/s3-sse-tests.yml

@@ -237,7 +237,8 @@ jobs:
           echo "   - SSE-C copy operations: HTTP 500 errors (pre-existing functionality gap)"
           echo "   - Cross-encryption security fix: ✅ Implemented and tested (forces streaming copy)"
           echo "   - These limitations are documented as pre-existing issues"
-          exit 0  # Job succeeds with security fix preserved and limitations documented
+          echo "❌ Failing job to ensure these limitations are addressed in the future"
+          exit 1  # Job fails to ensure known limitations are tracked and addressed
 
       - name: Upload server logs on failure
         if: failure()
@@ -286,7 +287,8 @@ jobs:
           echo "   - SSE-C multipart GET operations: HTTP 500 errors (pre-existing functionality gap)"  
           echo "   - SSE-KMS multipart decryption: Requires per-chunk SSE metadata architecture changes"
           echo "   - These limitations are documented and require future architectural work"
-          exit 0  # Job succeeds with clear documentation of known limitations
+          echo "❌ Failing job to ensure these limitations are addressed in the future"
+          exit 1  # Job fails to ensure known limitations are tracked and addressed
 
       - name: Upload server logs on failure
         if: failure()