AWS::EC2::VPCEndpoint - Drift not checked / detected

### Name of the resource

AWS::EC2::VPCEndpoint

### Issue Description

After deploying a AWS::EC2::VPCEndpoint resource within a CloudFormation stack, then performing drift detection on the stack, the drift results do not include the AWS::EC2::VPCEndpoint resource, yet the [documentation](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/resource-import-supported-resources.html?icmpid=docs_cfn_console) shows that this is a resource type which supports drift detection operations.

### Expected Behavior

Since this resource type is supported, as per the AWS docs, the drift results should include it, and also indicate whether there is drift or not.

### Observed Behavior

Drift results do not include AWS::EC2::VPCEndpoint resources, whether the resource is actually drifted or not.

### Test Cases

Deploying any AWS::EC2::VPCEndpoint resource appears to yield the same result. I used the [example template](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-vpcendpoint.html#aws-resource-ec2-vpcendpoint--examples--Create_a_gateway_endpoint) in the AWS docs to test this.

Start with the AWS::EC2::VPCEndpoint documentation and its linked example template, then reproduce stack deployment and drift detection using that template. Compare the resulting drift output with the documented support for drift detection. Done means the endpoint appears in drift results and correctly reports whether it is drifted.

Written by the indexing model from the issue text.