test: add uts for cni add function

[QxBytes]

Reason for Change:

Adds unit tests to test that endpoint info struct creation is as expected based on args, cns/ipam invoker response, and network configuration for the following scenarios:

• swiftv2 linux ipam response (infra + delegated) -> endpoint info
• swiftv2 windows ipam response (infra + delegated) -> endpoint info
• swiftv1 windows multitenancy dual nic ipam response (infra + infra) -> endpoint info
• swiftv1 linux multitenancy (infra) ipam response -> endpoint info

Each scenario tests the Add method from ipam response until we call an EndpointCreate, given args, ipam response, and network configuration and ensure the endpoint info struct generated exactly matches what is expected (so all fields are checked) except for the interface name and endpoint id as they are nondeterministic identifiers generated during runtime.

Adds a check to ensure each endpoint info's Option and Data fields are separate.
Adds a check to ensure swiftv2 linux's endpoint info interface name is overwritten with the correct interface name.

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• relevant PR labels added

Notes:
This does not add tests for swiftv2 ib. It also does not explicitly add tests for swiftv1 non multitenancy scenarios as they are mostly covered by the multitenancy ones (singletenancy is just a single ipam response). This does not test anything that happens inside EndpointCreate.

[QxBytes]

/azp run Azure Container Networking PR

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).