Remove classiclink support

[cdobbyn]

Describe the Bug

New versions of the AWS provider are now warning about the deprecated setting enable_classiclink as this functionality no longer exists within AWS.

Expected Behavior

No warning appears.

Steps to Reproduce

1. Update your AWS provider to the latest version
2. Try to run a terraform plan for a new or existing VPC.

Screenshots

n/a - see additional context

Environment (please complete the following information):

terraform 1.2.x
aws provider 4.29.0

Additional Context

Fixing this issue will reduce backwards compatibility with older aws providers which required this setting.

Example output:

╷
│ Warning: Argument is deprecated
│ 
│   with module.access_vpc_01.module.this_vpc.aws_vpc.default,
│   on .terraform/modules/access_vpc_01.this_vpc/main.tf line 40, in resource "aws_vpc" "default":
│   40:   enable_classiclink               = local.classiclink_enabled
│ 
│ With the retirement of EC2-Classic the enable_classiclink attribute has
│ been deprecated and will be removed in a future version.
│ 
│ (and 7 more similar warnings elsewhere)
╵

[babebort]

thill the same

Warning: Argument is deprecated │ │ with module.vpc.aws_vpc.default[0], │ on .terraform/modules/vpc/main.tf line 40, in resource "aws_vpc" "default": │ 40: enable_classiclink = local.classiclink_enabled │ │ With the retirement of EC2-Classic the enable_classiclink attribute has been deprecated and will be removed in a future version. │ │ (and one more similar warning elsewhere)