fix(cloudwatch): cloudwatch ec2 alarm action with multiple dimension results in error #29364
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Issue # (if applicable)
Closes #29331
Reason for this change
While trying to create a Custom Metric with multiple dimension, and adding EC2 action, the CDK synth fails.
Description of changes
As long as there's instance id in dimension, we should accept it instead of raising exception.
Description of how you validated changes
new tests and existing tests pass.
Checklist
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license