Trim response to just needed body (#7190)

[nananosirova]

https://redhat.atlassian.net/browse/RHOAIENG-57752

Description

Trim the k8 api response in NIM serving route to return only the body field instead of the whole response object.

How Has This Been Tested?

While logged into the dashboard, navigate to <base-url>/api/nim-serving/apiKeySecret.
With no NIM Account CR on the cluster, the endpoint returns 404 response object.
After applying a test Account CR and linked Secret:

apiVersion: nim.opendatahub.io/v1
kind: Account
metadata:
  name: example
  namespace: redhat-ods-applications
spec:
  apiKeySecret:
    name: foo-bar
---
apiVersion: v1
kind: Secret
metadata:
  name: foo-bar
  namespace: redhat-ods-applications
type: Opaque
data:
  foo: YmFy

Going back to the endpoint, it should return the response body only.

Test Impact

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has added tests or explained why testing cannot be added (unit or cypress tests for related changes)
• The code follows our Best Practices (React coding standards, PatternFly usage, performance considerations)

If you have UI changes:

• Included any necessary screenshots or gifs if it was a UI change.
• Included tags to the UX team if it was a UI/UX change.

After the PR is posted & before it merges:

• The developer has tested their solution on a cluster by using the image produced by the PR to main

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