fix(cloudwatch): allow up to 30 dimensions for metric (#29341)

### Issue # (if applicable)

Closes #29322.

### Reason for this change

[AWS::CloudWatch::Alarm](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-cloudwatch-alarm.html) allows up to 30 dimension items, while the L2 [construct](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_cloudwatch.Metric.html#dimensions) for Metric allows up to 10.

### Description of changes

Increased hard limit from 10 -> 30 

### Description of how you validated changes

Updated unit test, added new integration test

### 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*

packages/@aws-cdk-testing/framework-integ/test/aws-cloudwatch/test/integ.metric-with-dimensions.js.snapshot/aws-cdk-cloudwatch-metric-dimensions.template.json

@@ -0,0 +1,105 @@
+{
+ "Resources": {
+  "queue": {
+   "Type": "AWS::SQS::Queue"
+  },
+  "Alarm7103F465": {
+   "Type": "AWS::CloudWatch::Alarm",
+   "Properties": {
+    "ComparisonOperator": "GreaterThanOrEqualToThreshold",
+    "DatapointsToAlarm": 2,
+    "Dimensions": [
+     {
+      "Name": "BlankD1",
+      "Value": "value1"
+     },
+     {
+      "Name": "BlankD10",
+      "Value": "value10"
+     },
+     {
+      "Name": "BlankD2",
+      "Value": "value2"
+     },
+     {
+      "Name": "BlankD3",
+      "Value": "value3"
+     },
+     {
+      "Name": "BlankD4",
+      "Value": "value4"
+     },
+     {
+      "Name": "BlankD5",
+      "Value": "value5"
+     },
+     {
+      "Name": "BlankD6",
+      "Value": "value6"
+     },
+     {
+      "Name": "BlankD7",
+      "Value": "value7"
+     },
+     {
+      "Name": "BlankD8",
+      "Value": "value8"
+     },
+     {
+      "Name": "BlankD9",
+      "Value": "value9"
+     },
+     {
+      "Name": "QueueName",
+      "Value": {
+       "Fn::GetAtt": [
+        "queue",
+        "QueueName"
+       ]
+      }
+     }
+    ],
+    "EvaluationPeriods": 3,
+    "MetricName": "ApproximateNumberOfMessagesVisible",
+    "Namespace": "AWS/SQS",
+    "Period": 300,
+    "Statistic": "Average",
+    "Threshold": 100
+   }
+  }
+ },
+ "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."
+    }
+   ]
+  }
+ }
+}