TPT-4462: Add test for RDMA Linode instance creation

[mawilk90]

📝 Description

Additional test case for RDMA linode instance creation with linodepy

Note:
test_linode_interfaces_with_rdma_vpc_type is marked as skipped because it requires manual infra changes

✔️ How to Test

make test-int TEST_ARGS="-k test_linode_interfaces_with_rdma_vpc_type"

[Copilot]

Pull request overview

Adds an (currently skipped) integration test intended to validate creation of Linode instances configured with RDMA VPC interfaces, plus supporting fixtures/helpers to create RDMA VPC resources in a consistent region.

Changes:

• Add helpers and a new (skipped) integration test for creating a Linode with multiple RDMA VPC interfaces plus a regular VPC interface.
• Extend integration fixtures to reuse a chosen VPC region across VPC and RDMA-VPC creation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
test/integration/models/linode/interfaces/test_interfaces.py	Adds RDMA interface builders and a skipped test for RDMA Linode instance creation using Linode interfaces.
test/integration/conftest.py	Introduces a shared VPC region variable to align region selection between VPC and RDMA VPC fixtures.

Suppressed comments (1)

test/integration/models/linode/interfaces/test_interfaces.py:520

• firewall_id=-1 will be sent to the API as an invalid firewall ID. If the intent is “no firewall”, pass None (the key will still be included due to always_include).

            firewall_id=-1,

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