Fix repeated conditional tests warnings and enforce rule in CI

Fixed RpC_REPEATED_CONDITIONAL_TEST violations in:
- GridBagConstraints.java: Fixed copy-paste error in insets check
- CSSBorder.java: Fixed redundant quote check
- ImageViewer.java: Fixed logic in keyReleased method
- Container.java: Simplified componentAt logic
- Form.java: Removed redundant nested if check

Updated generate-quality-report.py to enforce this rule.

Author: google-labs-jules[bot]

CodenameOne/src/com/codename1/ui/Form.java

@@ -1462,11 +1462,9 @@ public Container getLayeredPane(Class c, boolean top) {
             layeredPaneImpl.add(cnt);
         } else {
             if (componentCount > 0) {
-                if (componentCount > 0) {
-                    Integer z = (Integer) children.get(0).getClientProperty(Z_INDEX_PROP);
-                    if (z != null) {
-                        zIndex = z.intValue();
-                    }
+                Integer z = (Integer) children.get(0).getClientProperty(Z_INDEX_PROP);
+                if (z != null) {
+                    zIndex = z.intValue();
                 }
             }
             layeredPaneImpl.addComponent(0, cnt);