migrate to helm-unittest/helm-unittest

[freeznet]

(If this PR fixes a github issue, please add Fixes #<xyz>.)

Fixes #

(or if this PR is one task of a github issue, please add Master Issue: #<xyz> to link to the master issue.)

Master Issue: #

Motivation

Since the end of January 2023, a new version of the unittest plugin is published in the main repository helm-unittest/helm-unittest.

Run helm plugin install https://github.com/quintush/helm-unittest
Support linux-amd64
Retrieving https://api.github.com/repos/helm-unittest/helm-unittest/releases/latest
No download_url found only searching for linux
Downloading  to location /tmp/_dist/
curl: Remote file name has no length!
curl: (23) Failed writing received data to disk/application
Failed to install helm-unittest
For support, go to https://github.com/kubernetes/helm
Error: plugin install hook for "unittest" exited with error
Error: Process completed with exit code 1.

Modifications

Describe the modifications you've done.

Verifying this change

• Make sure that the change passes the CI checks.

(Please pick either of the following options)

This change is a trivial rework / code cleanup without any test coverage.

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

Documentation

Check the box below.

Need to update docs?

• doc-required

  (If you need help on updating docs, create a doc issue)

• no-need-doc

  (Please explain why)

• doc

  (If this PR contains doc changes)

[github-actions]

@freeznet:Thanks for your contribution. For this PR, do we need to update docs?
(The PR template contains info about doc, which helps others know more about the changes. Can you provide doc-related info in this and future PR descriptions? Thanks)