feat: Add additional_tags to CE logic

[mitch-hamm]

Summary

Adds additional_tags support to the streamnative_cloud_environment resource.

• New optional additional_tags field (TypeMap of string) on the streamnative_cloud_environment resource
• On create/update, the map is JSON-serialized and stored as a single annotation: cloud.streamnative.io/environment-parameter-additional_tags
• On read, the annotation is deserialized back into state
• On update, the annotation is replaced when the field changes, and removed when set to empty

Example usage

resource "streamnative_cloud_environment" "example" {
  organization          = "o-example"
  region                = "us-east-1"
  cloud_connection_name = "my-connection"
  network {
    cidr = "10.0.0.0/16"
  }
  additional_tags = {
    test  = "test"
  }
}

This produces the annotation:

cloud.streamnative.io/environment-parameter-additional_tags: {"test":"test"}

[mitch-hamm]

Let's run toLower() if that tf var is defined on the GCP resource

[Copilot]

Pull request overview

Adds an additional_tags map attribute to streamnative_cloud_environment, persisting it into a Kubernetes annotation and hydrating it back into Terraform state on read.

Changes:

• Adds optional additional_tags (map of strings) to the cloud environment resource schema.
• Serializes/deserializes additional_tags as JSON in the cloud.streamnative.io/environment-parameter-additional_tags annotation on create/update/read.
• Adds provider description text for the new field.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
cloud/resource_cloud_environment.go	Adds schema + create/update/write/read logic to persist additional_tags via a single JSON annotation.
cloud/provider.go	Adds the additional_tags field description string.

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[mitch-hamm]

@maxsxu I validated this but looks like something unrelated in the test suite is now failing. Can we merge and then fix the acceptance tests?