Multiple improvements for linode interface resource

[zliang-akamai]

📝 Description

• Add resource prefix for resource schema attribute variables, in order to distinguish them with the incoming data source variables.
• Remove not configurable attribute route_target in the configured IPv6 attribute.
• Add multiple custom types for IP addresses and ranges.
• Remove UseStateForUnknown plan modifier for shared IP addresses because we can't be certain during an update operation if a new shared IP is assigned to the interface.

✔️ How to Test

make test-int PKG_NAME=linodeinterface PARALLEL=5

[Copilot]

Pull Request Overview

This PR implements multiple improvements to the Linode interface resource, focusing on better variable organization, schema refinements, and type safety enhancements.

• Adds resource prefix to schema attribute variables to distinguish them from future data source variables
• Removes the non-configurable route_target attribute from configured IPv6 ranges and adds custom IP type validation
• Introduces separate model types for configured vs computed IPv6 ranges to better represent their different schemas

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
framework_resource_schema.go	Renames schema variables with resource prefix, removes route_target from configured ranges, adds custom IP types
framework_public_models.go	Splits IPv6 range model into separate configured/computed types, updates variable references
framework_vpc_models.go	Updates variable references to use new resource-prefixed names
framework_models.go	Updates variable references to use new resource-prefixed names
interface.md	Removes documentation for the route_target attribute that was removed from configured ranges

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