Update "make gotests/gen" command

[kevindiu]

Description:

This PR updates make gotests/gen command with the following update:

• Generate only New() test case in pkg/*/usecase package
• Do not generate test cases under pkg/*/router, pkg/*/handler/rest package
• Generate only exported function tests under pkg package
• Comment out all the unimplemented test under the NOT IMPLEMENTED BELOW placeholder
• Fix /gen-test ChatOpts error

Related Issue:

Versions:

• Go Version: 1.20.3
• Docker Version: 20.10.8
• Kubernetes Version: 1.22.0
• NGT Version: 2.0.11

Checklist:

• I have read the CONTRIBUTING document and completed our CLA agreement.
• I have checked open Pull Requests for the similar feature or fixes?

Special notes for your reviewer:

Since the changes of the ChatOpts does not have any affect before the PR is merged, we need to create another PR to test it later.

[vdaas-ci]

[CHATOPS:HELP] ChatOps commands.

• 🙆‍♀️ /approve - approve
• 💌 /changelog - replace the PR body by changelog details
• 🍱 /format - format codes and add licenses
• ✅ /gen-test - generate test codes
• 🏷️ /label - add labels
• ⏪ /rebase - rebase main
• 🔚 2️⃣ 🔚 /label actions/e2e-deploy - run E2E deploy & integration test

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