fix(events): imported event rule ignores environment from arn (#27907)

This PR fixes the bug that `fromEventRuleArn` does not extract region and account from the arn.

- Behavior until now

```ts
    const stack = new Stack(); // <- region: us-east-1, account: 123456789012
    const imported = Rule.fromEventRuleArn(stack, 'Imported', 'arn:aws:events:us-west-2:999999999999:rule/example');

    // imported.env.region : us-east-1("Ref": "AWS::Region"). But it should be us-west-2.
    // imported.env.account : 123456789012("Ref": "AWS::AccountId"). But it should be 999999999999.
```

----

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

packages/aws-cdk-lib/aws-events/lib/rule.ts

@@ -75,7 +75,9 @@ export class Rule extends Resource implements IRule {
       public ruleArn = eventRuleArn;
       public ruleName = parts.resourceName || '';
     }
-    return new Import(scope, id);
+    return new Import(scope, id, {
+      environmentFromArn: eventRuleArn,
+    });
   }
 
   public readonly ruleArn: string;

packages/aws-cdk-lib/aws-events/test/rule.test.ts

@@ -578,6 +578,20 @@ describe('rule', () => {
     expect(importedRule.ruleName).toEqual('example');
   });
 
+  test('sets account for imported rule env by fromEventRuleArn', () => {
+    const stack = new cdk.Stack();
+    const importedRule = Rule.fromEventRuleArn(stack, 'Imported', 'arn:aws:events:us-west-2:999999999999:rule/example');
+
+    expect(importedRule.env.account).toEqual('999999999999');
+  });
+
+  test('sets region for imported rule env by fromEventRuleArn', () => {
+    const stack = new cdk.Stack();
+    const importedRule = Rule.fromEventRuleArn(stack, 'Imported', 'arn:aws:events:us-west-2:999999999999:rule/example');
+
+    expect(importedRule.env.region).toEqual('us-west-2');
+  });
+
   test('rule can be disabled', () => {
     // GIVEN
     const stack = new cdk.Stack();