TPT-4656: Support NodeBalancer type and backend connectivity

[zliang-akamai]

📝 Description

Add SDK support for NodeBalancer type and backend_connectivity.

✔️ How to Test

Unit Testing

python -m pytest test/unit/objects/nodebalancers_test.py test/unit/linode_client_test.py::NodeBalancerGroupTest

Integration Testing

make TEST_SUITE="nodebalancer" TEST_CASE="test_create_nb" test-int

[Copilot]

Pull request overview

Adds SDK support for NodeBalancer type and backend_connectivity by exposing them as read-only model properties, documenting the new create-time parameters, and extending tests/fixtures to cover IPv6 backend address formats and the new response fields.

Changes:

• Expose NodeBalancer.type and NodeBalancer.backend_connectivity as read-only properties and ensure they are omitted from PUT payloads.
• Document type, backend_connectivity, vpcs, and configs on NodeBalancer creation, and update node address documentation to include IPv6 bracketed formats.
• Expand unit/integration test coverage and fixtures to validate the new fields and IPv6 node address forwarding.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
test/unit/objects/nodebalancers_test.py	Adds unit tests for IPv6 node creation, config rebuild with IPv6 nodes, and NodeBalancer type/backend_connectivity behavior.
test/unit/linode_client_test.py	Adds unit tests ensuring create() forwards type, backend_connectivity, configs node addresses, and vpcs.
test/integration/models/nodebalancer/test_nodebalancer.py	Updates integration create test to pass and assert type/backend_connectivity.
test/fixtures/nodebalancers.json	Extends list fixture data with type and backend_connectivity.
test/fixtures/nodebalancers_123456.json	Extends single NodeBalancer fixture with type and backend_connectivity.
test/fixtures/linode_instances_123_nodebalancers.json	Extends Linode->NodeBalancers fixture with type and backend_connectivity.
linode_api4/objects/nodebalancer.py	Updates node address docstring and adds NodeBalancer type/backend_connectivity properties.
linode_api4/groups/nodebalancer.py	Documents type, backend_connectivity, vpcs, and configs kwargs on NodeBalancer create.

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[Copilot]

🟢 Approval recommended

The changes are additive, consistent with existing patterns, and are backed by targeted unit/integration tests plus fixture updates.

Review details

• Files reviewed: 8/8 changed files
• Comments generated: 0 new
• Review effort level: Lite

[psnoch-akamai]

LGTM. Do you want to merge it directly to dev or maybe proj branch?