CKV2_AWS_49: False positive when endpoint_type not hardcoded

[DzeryCZ]

Describe the issue
CKV2_AWS_49 has false positives when endpoint_type not hardcoded
This check fails, when using a variable and endpoint_type is not set strictly to source or target.

• https://github.com/bridgecrewio/checkov/blob/main/checkov/terraform/checks/graph_checks/aws/DMSEndpointHaveSSLConfigured.yaml#L35
• https://github.com/bridgecrewio/checkov/blob/main/checkov/terraform/checks/graph_checks/aws/DMSEndpointHaveSSLConfigured.yaml#L13

Examples

resource "aws_dms_endpoint" "endpoint" {
  endpoint_type          = var.type    #<- not set strictly to `source` or `target` string
  engine_name            = "postgres"
  ssl_mode                   = "require"
  ...
}

Version (please complete the following information):

• Checkov Version 3.2.353

Additional context
N/A