chore(init-templates): allow renaming in templates for cdk migrate apps (#27166)

New integ test for the new CDK migrate command. Template.txt is a sample cloudformation template with enough complexity to be a good enough sample.

Tests for Java and Csharp aren't there because they are broken right now. Add them back after we fix

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: HBobertz

packages/aws-cdk/lib/init-templates/app/csharp/src/%name.PascalCased%/Program.template.cs

@@ -3,14 +3,14 @@
 using System.Collections.Generic;
 using System.Linq;
 
-namespace %name.PascalCased%
+namespace %PascalNameSpace%
 {
     sealed class Program
     {
         public static void Main(string[] args)
         {
             var app = new App();
-            new %name.PascalCased%Stack(app, "%stackname%", new StackProps
+            new %name.PascalCased%Stack(app, "%stackname%", new %PascalStackProps%
             {
                 // If you don't specify 'env', this stack will be environment-agnostic.
                 // Account/Region-dependent features and context lookups will not work,

packages/aws-cdk/lib/init.ts

@@ -173,6 +173,8 @@ export class InitTemplate {
     }
     return template.replace(/%name%/g, project.name)
       .replace(/%stackname%/, project.stackName ?? '%name.PascalCased%Stack')
+      .replace(/%PascalNameSpace%/, project.stackName ? camelCase(project.stackName + 'Stack', { pascalCase: true }) : '%name.PascalCased%')
+      .replace(/%PascalStackProps%/, project.stackName ? (camelCase(project.stackName, { pascalCase: true }) + 'StackProps') : 'StackProps')
       .replace(/%name\.camelCased%/g, camelCase(project.name))
       .replace(/%name\.PascalCased%/g, camelCase(project.name, { pascalCase: true }))
       .replace(/%cdk-version%/g, cdkVersion)

packages/aws-cdk/test/commands/migrate.test.ts

@@ -177,7 +177,7 @@ describe('Migrate Function Tests', () => {
     // Replaced stack file is referenced correctly in app file
     const app = fs.readFileSync(path.join(workDir, 'GoodCSharp', 'src', 'GoodCSharp', 'Program.cs'), 'utf8').split('\n');
     expect(app.map(line => line.match('namespace GoodCSharp')).filter(line => line).length).toEqual(1);
-    expect(app.map(line => line.match(/        new GoodCSharpStack\(app, "GoodCSharp", new StackProps/)).filter(line => line).length).toEqual(1);
+    expect(app.map(line => line.match(/        new GoodCSharpStack\(app, "GoodCSharp", new GoodCSharpStackProps/)).filter(line => line).length).toEqual(1);
 
     // Replaced stack file is correctly generated
     const replacedStack = fs.readFileSync(path.join(workDir, 'GoodCSharp', 'src', 'GoodCSharp', 'GoodCSharpStack.cs'), 'utf8');