feat(ec2): make VPC internet gateway creation controllable (aws#26314)

The `createInternetGateway` allows disabling the creation of a default internet gateway for VPSs with non-isolated subnets.

Closes aws#26270.

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*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/framework-integ/test/aws-ec2/test/integ.vpc-no-default-igw.js.snapshot/VpcNoDefaultIgwDefaultTestDeployAssertDB3FDBEB.assets.json

@@ -0,0 +1,19 @@
+{
+  "version": "32.0.0",
+  "files": {
+    "21fbb51d7b23f6a6c262b46a9caee79d744a3ac019fd45422d988b96d44b2a22": {
+      "source": {
+        "path": "VpcNoDefaultIgwDefaultTestDeployAssertDB3FDBEB.template.json",
+        "packaging": "file"
+      },
+      "destinations": {
+        "current_account-current_region": {
+          "bucketName": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}",
+          "objectKey": "21fbb51d7b23f6a6c262b46a9caee79d744a3ac019fd45422d988b96d44b2a22.json",
+          "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-file-publishing-role-${AWS::AccountId}-${AWS::Region}"
+        }
+      }
+    }
+  },
+  "dockerImages": {}
+}

packages/@aws-cdk-testing/framework-integ/test/aws-ec2/test/integ.vpc-no-default-igw.js.snapshot/VpcNoDefaultIgwDefaultTestDeployAssertDB3FDBEB.template.json

@@ -0,0 +1,36 @@
+{
+ "Parameters": {
+  "BootstrapVersion": {
+   "Type": "AWS::SSM::Parameter::Value<String>",
+   "Default": "/cdk-bootstrap/hnb659fds/version",
+   "Description": "Version of the CDK Bootstrap resources in this environment, automatically retrieved from SSM Parameter Store. [cdk:skip]"
+  }
+ },
+ "Rules": {
+  "CheckBootstrapVersion": {
+   "Assertions": [
+    {
+     "Assert": {
+      "Fn::Not": [
+       {
+        "Fn::Contains": [
+         [
+          "1",
+          "2",
+          "3",
+          "4",
+          "5"
+         ],
+         {
+          "Ref": "BootstrapVersion"
+         }
+        ]
+       }
+      ]
+     },
+     "AssertDescription": "CDK bootstrap stack version 6 required. Please run 'cdk bootstrap' with a recent version of the CDK CLI."
+    }
+   ]
+  }
+ }
+}

packages/@aws-cdk-testing/framework-integ/test/aws-ec2/test/integ.vpc-no-default-igw.js.snapshot/aws-cdk-vpc-no-default-igw.assets.json

@@ -0,0 +1,32 @@
+{
+  "version": "32.0.0",
+  "files": {
+    "ba598c1f1d84f7077ea9c16a6b921e4f8acf18e996100e72a8f17da980e64fdd": {
+      "source": {
+        "path": "asset.ba598c1f1d84f7077ea9c16a6b921e4f8acf18e996100e72a8f17da980e64fdd",
+        "packaging": "zip"
+      },
+      "destinations": {
+        "current_account-current_region": {
+          "bucketName": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}",
+          "objectKey": "ba598c1f1d84f7077ea9c16a6b921e4f8acf18e996100e72a8f17da980e64fdd.zip",
+          "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-file-publishing-role-${AWS::AccountId}-${AWS::Region}"
+        }
+      }
+    },
+    "2b0168fea675c106b8a4f9e2e05c38b1ed7c1a032ed9ba0a40438b4686f0647d": {
+      "source": {
+        "path": "aws-cdk-vpc-no-default-igw.template.json",
+        "packaging": "file"
+      },
+      "destinations": {
+        "current_account-current_region": {
+          "bucketName": "cdk-hnb659fds-assets-${AWS::AccountId}-${AWS::Region}",
+          "objectKey": "2b0168fea675c106b8a4f9e2e05c38b1ed7c1a032ed9ba0a40438b4686f0647d.json",
+          "assumeRoleArn": "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/cdk-hnb659fds-file-publishing-role-${AWS::AccountId}-${AWS::Region}"
+        }
+      }
+    }
+  },
+  "dockerImages": {}
+}