Fix visual tests (#62660)

Author: liza-mae

test/scripts/jenkins_visual_regression.sh

@@ -12,7 +12,7 @@ tar -xzf "$linuxBuild" -C "$installDir" --strip=1
 
 echo " -> running visual regression tests from kibana directory"
 checks-reporter-with-killswitch "X-Pack visual regression tests" \
-  yarn percy exec -t 500 \
+  yarn percy exec -t 500 -- -- \
   node scripts/functional_tests \
     --debug --bail \
     --kibana-install-dir "$installDir" \

test/scripts/jenkins_xpack_visual_regression.sh

@@ -14,7 +14,7 @@ tar -xzf "$linuxBuild" -C "$installDir" --strip=1
 echo " -> running visual regression tests from x-pack directory"
 cd "$XPACK_DIR"
 checks-reporter-with-killswitch "X-Pack visual regression tests" \
-  yarn percy exec -t 500 \
+  yarn percy exec -t 500 -- -- \
   node scripts/functional_tests \
     --debug --bail \
     --kibana-install-dir "$installDir" \