Project: Add support for NB Front-End IP in VPC-MTC + 40Gbps NB-MTC

[mawilk90]

📝 Description

This PR merges support for NB Front-End IP + 40Gbps features into the main branch for release.

✔️ How to Test

make test-unit
make test-int TEST_ARGS="-run TestNodeBalancer_Create_With"

[Copilot]

Pull request overview

This PR extends linodego’s NodeBalancer support to cover (1) Premium 40Gbps plans and (2) NodeBalancer front-end IPs in VPC, including new VPC config list/get endpoints and corresponding unit/integration fixtures/tests.

Changes:

• Add NodeBalancer fields and create options for frontend_vpcs, backend_vpcs (plus deprecated vpcs) and the new premium_40gb plan type.
• Add NodeBalancer VPC config purpose support and client methods to list/get configs from /vpcs, /backend_vpcs, and /frontend_vpcs.
• Expand unit/integration test coverage and fixtures for the new NodeBalancer/VPC behaviors.

Reviewed changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 12 comments.

Show a summary per file

File	Description
nodebalancer.go	Adds NodeBalancer front-end VPC fields, new plan type constant, and create options for frontend/backend VPCs.
nodebalancer_config_vpc.go	Adds VPC config purpose plus new list endpoints for backend/frontend configs.
test/unit/nodebalancer_test.go	Updates unit tests/fixtures assertions for the new NB fields/type and adds create tests for VPC options.
test/unit/nodebalancer_config_vpc_test.go	Adds unit tests for NodeBalancer VPC config list/get endpoints.
test/unit/fixtures/nodebalancers_list.json	Updates list fixture to include type and front-end VPC fields.
test/unit/fixtures/nodebalancer_get.json	Updates get fixture to include type and front-end VPC fields.
test/unit/fixtures/nodebalancer_create_with_vpcs.json	Adds create fixture for NB with backend/frontend VPCs.
test/unit/fixtures/nodebalancer_vpc_config_*.json	Adds fixtures for VPC config list/get endpoints.
test/integration/nodebalancers_test.go	Adds integration tests for frontend/backend VPC scenarios and premium_40gb.
test/integration/vpc_subnet_test.go	Ensures VPC setup selects regions with NodeBalancer capability.
test/integration/instance_config_test.go	Updates region selection to use capability filtering (no hardcoded region).
test/integration/util_test.go	Adds generic getIntersection helper used for region selection.
test/integration/fixtures/TestNodeBalancer_*.yaml	Adds recorded fixtures for new integration test scenarios.

Comments suppressed due to low confidence (1)

test/unit/nodebalancer_test.go:99

• This test’s expectations depend on the position of the test case in tests (via idx), making it brittle if the table ordering changes. Prefer branching on a stable attribute (e.g., tt.fixture) or adding explicit expected fields to the table.

	for idx, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			fixtureData, err := fixtures.GetFixture(tt.fixture)
			assert.NoError(t, err)

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