fix(events): cannot have more than one cross-account Rule (#19441)

Fixes #12479, Resolves #12538

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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*

Author: cgarvis

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

@@ -397,7 +397,7 @@ export class Rule extends Resource implements IRule {
         });
         new CfnEventBusPolicy(eventBusPolicyStack, 'GivePermToOtherAccount', {
           action: 'events:PutEvents',
-          statementId: `Allow-account-${sourceAccount}`,
+          statementId: `Allow-account-${sourceAccount}-${this.node.addr}`,
           principal: sourceAccount,
         });
       }

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

@@ -901,6 +901,7 @@ describe('rule', () => {
       const app = new cdk.App();
 
       const sourceAccount = '123456789012';
+      const nodeAddr = 'c810f4680339b01edf1f157c4fd07da73469742773';
       const sourceStack = new cdk.Stack(app, 'SourceStack', {
         env: {
           account: sourceAccount,
@@ -982,7 +983,7 @@ describe('rule', () => {
       const eventBusPolicyStack = app.node.findChild(`EventBusPolicy-${sourceAccount}-us-west-2-${targetAccount}`) as cdk.Stack;
       Template.fromStack(eventBusPolicyStack).hasResourceProperties('AWS::Events::EventBusPolicy', {
         'Action': 'events:PutEvents',
-        'StatementId': `Allow-account-${sourceAccount}`,
+        'StatementId': `Allow-account-${sourceAccount}-${nodeAddr}`,
         'Principal': sourceAccount,
       });
     });