feat(ecr): lookup existing repository (#33662)

### Issue # (if applicable)

Closes #8461.

### Reason for this change

`ecr.Repository` construct does not support lookup method.

### Description of changes

- Add `fromLookup` method

### Describe any new or updated permissions being added

None

### Description of how you validated changes

Add both unit and integ tests.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

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

Author: badmintoncryer

packages/@aws-cdk-testing/framework-integ/test/aws-ecr/test/integ.repository-lookup.js.snapshot/EcrRepoLookupStack.assets.json

@@ -0,0 +1,140 @@
+{
+ "Resources": {
+  "LambdaServiceRoleA8ED4D3B": {
+   "Type": "AWS::IAM::Role",
+   "Properties": {
+    "AssumeRolePolicyDocument": {
+     "Statement": [
+      {
+       "Action": "sts:AssumeRole",
+       "Effect": "Allow",
+       "Principal": {
+        "Service": "lambda.amazonaws.com"
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    },
+    "ManagedPolicyArns": [
+     {
+      "Fn::Join": [
+       "",
+       [
+        "arn:",
+        {
+         "Ref": "AWS::Partition"
+        },
+        ":iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
+       ]
+      ]
+     }
+    ]
+   }
+  },
+  "LambdaServiceRoleDefaultPolicyDAE46E21": {
+   "Type": "AWS::IAM::Policy",
+   "Properties": {
+    "PolicyDocument": {
+     "Statement": [
+      {
+       "Action": [
+        "ecr:DescribeImages",
+        "ecr:DescribeRepositories"
+       ],
+       "Effect": "Allow",
+       "Resource": {
+        "Fn::Join": [
+         "",
+         [
+          "arn:",
+          {
+           "Ref": "AWS::Partition"
+          },
+          ":ecr:us-east-1:123456789012:repository/DUMMY_ARN"
+         ]
+        ]
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    },
+    "PolicyName": "LambdaServiceRoleDefaultPolicyDAE46E21",
+    "Roles": [
+     {
+      "Ref": "LambdaServiceRoleA8ED4D3B"
+     }
+    ]
+   }
+  },
+  "LambdaD247545B": {
+   "Type": "AWS::Lambda::Function",
+   "Properties": {
+    "Code": {
+     "ZipFile": "exports.handler = async function(event, context) { return \"Hello, World!\"; }"
+    },
+    "Handler": "index.handler",
+    "Role": {
+     "Fn::GetAtt": [
+      "LambdaServiceRoleA8ED4D3B",
+      "Arn"
+     ]
+    },
+    "Runtime": "nodejs20.x"
+   },
+   "DependsOn": [
+    "LambdaServiceRoleDefaultPolicyDAE46E21",
+    "LambdaServiceRoleA8ED4D3B"
+   ]
+  }
+ },
+ "Outputs": {
+  "RepositoryUri": {
+   "Value": {
+    "Fn::Join": [
+     "",
+     [
+      "123456789012.dkr.ecr.us-east-1.",
+      {
+       "Ref": "AWS::URLSuffix"
+      },
+      "/DUMMY_ARN"
+     ]
+    ]
+   }
+  }
+ },
+ "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."
+    }
+   ]
+  }
+ }
+}