cleanup: delete unnecessary shell script

[jwcesign]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
cleanup: delete unnecessary shell script

Which issue(s) this PR fixes:
Fixes #none

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
To complete the pull request process, please assign garrybest after the PR has been reviewed.
You can assign the PR to them by writing /assign @garrybest in a comment when ready.

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

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (55547b2) 52.01% compared to head (4dd1197) 52.02%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4309   +/-   ##
=======================================
  Coverage   52.01%   52.02%           
=======================================
  Files         242      242           
  Lines       23993    23993           
=======================================
+ Hits        12481    12483    +2     
+ Misses      10832    10830    -2     
  Partials      680      680           

Flag	Coverage Δ
unittests	52.02% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.