TPT-4657: Add support for Backend Connectivity and more types in NodeBalancers

[zliang-akamai]

📝 Description

Add support for Backend Connectivity and more types in NodeBalancers, IPv6 support not included.

✔️ How to Test

make TEST_ARGS="-run TestNodeBalancer_Create_BackendConnectivity_Premium" test-int

[Copilot]

Pull request overview

This PR extends the NodeBalancer API surface in linodego by adding backend_connectivity support and expanding the recognized NodeBalancer plan type values, along with corresponding unit/integration test and fixture updates.

Changes:

• Added BackendConnectivity to NodeBalancer and NodeBalancerCreateOptions, plus NodeBalancerBackendConnectivity constants.
• Expanded NodeBalancerPlanType constants to include basic and enterprise, and documented deprecations for older aliases.
• Updated unit/integration tests and fixtures to cover backend connectivity behavior and new response fields.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
nodebalancer.go	Adds BackendConnectivity fields/types and extends plan type constants; updates GetCreateOptions behavior.
test/unit/nodebalancer_test.go	Adds unit coverage for backend_connectivity + type parsing and request body serialization.
test/unit/nodebalancer_node_test.go	Adds a unit test case for creating a NodeBalancer node with an IPv6 address string.
test/unit/fixtures/nodebalancers_list.json	Updates list fixture data to include type and backend_connectivity.
test/unit/fixtures/nodebalancer_update.json	Updates update fixture to include type and backend_connectivity.
test/unit/fixtures/nodebalancer_node_create_ipv6.json	New fixture for IPv6 node create response.
test/unit/fixtures/nodebalancer_get.json	Updates get fixture to include type and backend_connectivity.
test/unit/fixtures/nodebalancer_get_with_lke_cluster.json	Updates get-with-lke fixture to include backend_connectivity.
test/unit/fixtures/nodebalancer_create.json	Updates create fixture to include type and backend_connectivity.
test/unit/fixtures/nodebalancer_create_with_ipv4.json	Updates create-with-IPv4 fixture to include type and backend_connectivity.
test/unit/fixtures/nodebalancer_create_with_backend_connectivity.json	New fixture for create response including backend connectivity.
test/integration/nodebalancers_test.go	Adds an integration test for creating a premium NodeBalancer with backend connectivity set to IPv6.
test/integration/fixtures/TestNodeBalancer_Create_BackendConnectivity_Premium.yaml	New VCR fixture for the new backend connectivity integration test.

Suppressed comments (4)

test/unit/nodebalancer_test.go:137

• This assertion dereferences nodebalancer.BackendConnectivity without checking for nil, which can panic if the API/fixture omits backend_connectivity.

			assert.Equal(t, linodego.NBTypeCommon, nodebalancer.Type)
			assert.Equal(t, linodego.NBBackendConnectivityUndefined, *nodebalancer.BackendConnectivity)

test/unit/nodebalancer_test.go:175

• These assertions dereference nodebalancers[1].BackendConnectivity without a nil check, which can panic if backend_connectivity is omitted in the response.

	assert.Equal(t, linodego.NBTypePremium, nodebalancers[1].Type)
	assert.Equal(t, linodego.NBBackendConnectivityIPv6, *nodebalancers[1].BackendConnectivity)

test/unit/nodebalancer_test.go:208

• This assertion dereferences nodebalancer.BackendConnectivity without checking for nil, which can panic if backend_connectivity is omitted in the update response fixture/API.

	assert.Equal(t, linodego.NBTypeCommon, nodebalancer.Type)
	assert.Equal(t, linodego.NBBackendConnectivityLegacy, *nodebalancer.BackendConnectivity)

test/unit/nodebalancer_test.go:166

• These assertions dereference nodebalancers[0].BackendConnectivity without a nil check. Since BackendConnectivity is optional, this can panic if the field is omitted in the response.

	assert.Equal(t, linodego.NBTypeCommon, nodebalancers[0].Type)
	assert.Equal(t, linodego.NBBackendConnectivityUndefined, *nodebalancers[0].BackendConnectivity)

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