feat(curriculum): Add interactive examples to What Is a String in JavaScript, and What Is String Immutability lesson (#63176)

curriculum/challenges/english/blocks/lecture-introduction-to-strings/672d49a5cf43945ee09e5fba.md

@@ -5,7 +5,7 @@ challengeType: 19
 dashedName: what-is-a-string
 ---
 
-# --description--
+# --interactive--
 
 In JavaScript, a string is a sequence of characters used to represent text data. Strings are one of the primitive data types in the language, along with numbers, booleans, `null`, and `undefined`.
 
@@ -13,11 +13,17 @@ To create a string in JavaScript, you can use single quotes (`'`), or double quo
 
 Here is an example of creating two variables that hold string values:
 
+:::interactive_editor
+
 ```js
 let singleQuotes = 'This is a string';
+console.log(singleQuotes);
 let doubleQuotes = "This is also a string";
+console.log(doubleQuotes);
 ```
 
+:::
+
 Even though you can use single or double quotes to create strings, it's important to be consistent. If a string begins with a single quote, it must also end with a single quote.
 
 The same applies to double quotes. The following example will throw an error because it starts with a double quote and ends with a single quote:
@@ -30,11 +36,17 @@ Another thing to take into account is that strings are immutable. In programming
 
 Here is an example of assigning a new string to a `developer` variable:
 
+:::interactive_editor
+
 ```js
 let developer = "Jessica";
+console.log(developer);
 developer = "Quincy";
+console.log(developer);
 ```
 
+:::
+
 Since strings are immutable, we can't update the first string directly. That is why we are assigning a new string to the `developer` variable.
 
 Strings are an important part of programming, and in future lessons, you will learn advanced techniques for manipulating them and harnessing their full potential to create dynamic and interactive applications.