Remove unused code

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 23.61%. Comparing base (b0cc356) to head (15c91e1).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #181 +/- ## ======================================= Coverage 23.61% 23.61% ======================================= Files 9 9 Lines 1207 1207 ======================================= Hits 285 285 Misses 905 905 Partials 17 17 ``` | [Flag](https://app.codecov.io/gh/open-cluster-management-io/cluster-proxy/pull/181/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-cluster-management-io) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/open-cluster-management-io/cluster-proxy/pull/181/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-cluster-management-io) | `23.61% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-cluster-management-io#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[xuezhaojun]

/lgtm

[xuezhaojun]

/approve

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tamalsaha, xuezhaojun

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/open-cluster-management-io/cluster-proxy/blob/main/OWNERS)~~ [xuezhaojun] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment