Fix O2IMS controller library path

[arora-sagar]

In the previous commits, the folder structure was changed. In this PR, I changed to the initial structure and renamed the northbound api application (from app to northbound_restapi).

I have adjusted the testing environment, as the K8s version has changed.

Related issues --> #1036

[nephio-prow]

Hi @arora-sagar. Thanks for your PR.

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[efiacor]

/approve
/lgtm

[nephio-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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