TPT-4277 Implement support for Reserved IP for IPv4

[mgwoj]

📝 Description

Complete the Go SDK (linodego) support for the Reserved IP feature. Several foundations are already in place; this story addresses the remaining gaps to bring the SDK fully in line with the API Specification.

✔️ How to Test

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

As the API is not ready yet, there are only mocked integration tests.

[Copilot]

Pull request overview

Implements remaining Go SDK (linodego) support for the Reserved IPv4 feature to better align with the API spec, primarily by expanding reserved IP metadata support and adding unit coverage.

Changes:

• Add reserved_ipv4_addresses support to tag creation and decode tagged objects of type reserved_ipv4_address.
• Add reserved IP tags support plus new endpoints for updating a reserved IP and listing reserved IP types (pricing).
• Add/extend unit tests and fixtures to validate request bodies and response decoding for reserved IP behavior.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tags.go	Adds tag create option for reserved IPv4 addresses and decodes tagged reserved IP objects.
network_reserved_ips.go	Adds tag support for reserving IPs, plus update + types-list endpoints and related models.
instance_ips.go	Extends InstanceIP with tags field to capture reserved IP tags.
test/unit/tag_test.go	Adds unit coverage for tag create with reserved IPv4 addresses and tagged-object decoding.
test/unit/nodebalancer_test.go	Adds request-body validation test for NodeBalancer create with ipv4.
test/unit/network_reserved_ips_test.go	Extends reserved IP tests to cover tags, update, and type listing.
test/unit/network_ips_test.go	Adds request-body validation for reserve allocation and combined RDNS+reserved update.
test/unit/instance_test.go	Adds request-body validation for instance create with explicit IPv4 list.
test/unit/instance_ip_test.go	Adds request-body validation for assigning a reserved IP to an instance.
test/unit/fixtures/tagged_objects_reserved_ip_list.json	Adds fixture for tagged reserved IPv4 address objects.
test/unit/fixtures/network_reserved_ips_list.json	Updates reserved IP list fixture with reserved and tags.
test/unit/fixtures/network_reserved_ips_get.json	Updates reserved IP get fixture with reserved and tags.
test/unit/fixtures/network_reserved_ips.json	Updates reserve-IP create fixture with reserved and tags.
test/unit/fixtures/network_reserved_ip_update.json	Adds fixture for reserved IP update response.
test/unit/fixtures/network_reserved_ip_types_list.json	Adds fixture for reserved IP types (pricing) list response.

Comments suppressed due to low confidence (1)

test/unit/fixtures/network_reserved_ips_list.json:26

• This list fixture is missing the standard "page" field used by paginated list responses in this repo's fixtures. If this fixture is used with getPaginatedResults, pagination decoding may fail or behave inconsistently; add "page": 1 to match other list fixtures.

    ],
    "pages": 1,
    "results": 2
}

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