chore(cdk-testing): fix init-go canary (#28365)

The init-go canary was broken because the test replaced the aws-cdk go module with a locally build version. However in canaries we want to use the publish versioned instead. This change simply makes the replacement conditional.

Manually tested in CodeBuild.

----

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

packages/@aws-cdk-testing/cli-integ/tests/init-go/init-go.integtest.ts

@@ -2,13 +2,20 @@ import { integTest, withTemporaryDirectory, ShellHelper, withPackages } from '..
 
 ['app', 'sample-app'].forEach(template => {
   integTest(`init go ${template}`, withTemporaryDirectory(withPackages(async (context) => {
+    const isCanary = !!process.env.IS_CANARY;
     context.packages.assertJsiiPackagesAvailable();
 
     const shell = ShellHelper.fromContext(context);
     await context.packages.makeCliAvailable();
 
     await shell.shell(['cdk', 'init', '-l', 'go', template]);
-    await shell.shell(['go', 'mod', 'edit', '-replace', 'github.com/aws/aws-cdk-go/awscdk/v2=$CODEBUILD_SRC_DIR/go/awscdk']);
+
+    // Canaries will use the generated go.mod as is
+    // For pipeline tests we replace the source with the locally build one
+    if (!isCanary) {
+      await shell.shell(['go', 'mod', 'edit', '-replace', 'github.com/aws/aws-cdk-go/awscdk/v2=$CODEBUILD_SRC_DIR/go/awscdk']);
+    }
+
     await shell.shell(['go', 'mod', 'tidy']);
     await shell.shell(['go', 'test']);
     await shell.shell(['cdk', 'synth']);