refactor unit test to make test coverage measurable

[sunya-ch]

Currently, all unit test is under unit test folder. We need to refactor the module name to have test coverage measurable for both operator and daemonset test.

current:

	github.com/foundation-model-stack/multi-nic-cni		coverage: 0.0% of statements
	github.com/foundation-model-stack/multi-nic-cni/controllers/vars		coverage: 0.0% of statements
	github.com/foundation-model-stack/multi-nic-cni/compute		coverage: 0.0% of statements
	github.com/foundation-model-stack/multi-nic-cni/plugin		coverage: 0.0% of statements
	github.com/foundation-model-stack/multi-nic-cni/controllers		coverage: 0.0% of statements
	github.com/foundation-model-stack/multi-nic-cni/api/v1		coverage: 0.0% of statements
ok  	github.com/foundation-model-stack/multi-nic-cni/unit-test	14.363s	coverage: [no statements]

Tasks:

• move test cases to relevant module path chore: refactor unit-test and pack internal packages #261
• enable ginkgo test with readable report listing passed tests
• enable CI considering use https://github.com/apps/codecov
  example: feat(disable-power-models): Add DisablePowerModels flag sustainable-computing-io/kepler#1946 (comment)