feat(terraform): add aws_vpc_endpoint to RESOURCE_TYPES_JSONIFY

[guyg-palo]

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

Description

This change adds support for JSON-parsing the policy attribute of aws_vpc_endpoint resources in Terraform plan files. This allows Checkov to correctly evaluate policies that use the jsonpath_exists operator on the policy attribute of these resources.

Fixed Issue

This change fixes an issue where policies using the jsonpath_exists operator on the policy attribute of aws_vpc_endpoint resources would fail during Terraform plan scans.

Motivation and Context

Currently, the Terraform plan parser in Checkov does not recognize the policy attribute of aws_vpc_endpoint resources as a JSON object. As a result, the attribute is treated as a string, which causes the jsonpath_exists operator to fail. This change adds the aws_vpc_endpoint resource type to the RESOURCE_TYPES_JSONIFY dictionary in checkov/terraform/plan_parser.py, which instructs the parser to treat the policy attribute as a JSON object. This allows policies to correctly check for the existence of specific attributes within the policy, such as Statement.

Dependencies

There are no new dependencies required for this change.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my feature, policy, or fix is effective and works
• New and existing tests pass locally with my changes