fix: Quantum didn't handle replacement of if else conditions

Handle the following case:

if (a){} else if ( process.env.NODE_ENV == "production") {}

Quantum didn't replace these conditions and that lead to an error

src/quantum/core/AstUtils.ts

@@ -45,6 +45,10 @@ const ES6_TYPES = new Set([
 
 export function matchesIfStatementProcessEnv(node): string {
     if (node.type && node.type === "IfStatement") {
+        // prevent detecting if else statement
+        if (node.$parent && node.$parent.type === "IfStatement") {
+            return;
+        }
         if (node.test && node.test.type === "BinaryExpression") {
             if (node.test.left) {
                 const variableName = matchesNodeEnv(node.test.left);

src/quantum/tests/ProcessEnvReplacement.test.ts

@@ -123,4 +123,29 @@ export class ProcessEnvReplacement {
         });
     }
 
+    "Should replace in if else statement"() {
+        return createOptimisedBundleEnv({
+            stubs: true,
+            options: {
+                treeshake: false,
+            },
+            project: {
+                plugins: [EnvPlugin({ foo: "foo" })],
+                files: {
+                    "index.ts": `
+                        if (a) {
+                        }  else if (process.env.NODE_ENV !== 'production') {
+                        }
+                        
+                    }
+                    `
+                },
+                instructions: "index.ts",
+            },
+        }).then((result) => {
+            const contents = result.contents["index.js"];
+            should(contents).findString("else if ('production' !== 'production')");
+        });
+    }
+
 }