workflows: enforce list resource implementation for new resources

[katbyte]

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Description

This PR adds a new CI workflow that enforces all new resources added to the provider include a corresponding list resource implementation (*_resource_list.go).

With the introduction of the list block in Terraform 1.14+, every resource in the provider should support listing. This check ensures new resources aren't merged without their list implementation, preventing us from accumulating more list-resource debt.

How it works:

• A bash script (scripts/enforce-list-for-new-resources.sh) diffs the PR against origin/main to detect newly added *_resource.go files
• For each new resource file, it checks that a corresponding *_resource_list.go file exists
• If any are missing, the check fails with a clear message indicating what's expected

Skipping the check:

• If a resource genuinely cannot support listing (e.g. it has no List API), the allow-without-list label can be applied to the PR to skip the check

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
• I have updated/added Documentation as required written in a helpful and kind way to assist users that may be unfamiliar with the resource / data source.
• I have used a meaningful PR title to help maintainers and other users understand this change and help prevent duplicate work.

Changes to existing Resource / Data Source

N/A - This PR only adds CI tooling.

Change Log

• CI - add enforce-list-resources workflow to require list resource implementations for new resources

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

N/A

AI Assistance Disclosure

• AI Assisted - This contribution was made by, or with the assistance of, AI/LLMs

Script and workflow were generated with AI assistance, reviewed and tested locally.

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the provider.

Changes to Security Controls

No changes to security controls.