tests: allow WARN output during e2e update

The RHEL VEX feed data can produce warnings during database updates,
so warnings should not cause the e2e test to fail at this time.

Co-authored-by: OpenCode <noreply@opencode.ai>

Author: Mab879

tests/e2e.sh

@@ -29,8 +29,8 @@ else
 	echo "PASS: cvetool --version output: $version_output"
 fi
 
-# Test: `cvetool update` should not produce any warnings
-echo "Test: cvetool update produces no warnings..."
+# Test: `cvetool update` exits successfully
+echo "Test: cvetool update exits successfully..."
 tmpdb=$(mktemp)
 unwritable_dir=""
 cleanup() {
@@ -43,12 +43,6 @@ update_output=$("$cvetool" -l debug update --db-path "$tmpdb" 2>&1) || {
 	fail "cvetool update exited non-zero" "${update_output:-}"
 	update_ok=false
 }
-if echo "${update_output:-}" | grep -qi "WARN"; then
-	fail "cvetool update produced warnings" "$update_output"
-else
-	echo "PASS: no warnings in cvetool update output"
-fi
-
 if [ "$update_ok" = true ]; then
 	# Test: `cvetool scan` exits successfully (warnings are acceptable)
 	echo "Test: cvetool scan exits successfully..."