Remove unused mock

[khanhtc1202]

What this PR does:

as title

Why we need it:

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.28%. Comparing base (3e3df6d) to head (37dd02f).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6017   +/-   ##
=======================================
  Coverage   28.28%   28.28%           
=======================================
  Files         523      523           
  Lines       56135    56135           
=======================================
  Hits        15879    15879           
  Misses      39005    39005           
  Partials     1251     1251           

Flag	Coverage Δ
.	23.27% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes	65.94% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes_multicluster	67.33% <ø> (ø)
.-pkg-app-pipedv1-plugin-scriptrun	66.66% <ø> (ø)
.-pkg-app-pipedv1-plugin-terraform	80.26% <ø> (ø)
.-pkg-app-pipedv1-plugin-wait	35.51% <ø> (ø)
.-pkg-plugin-sdk	50.71% <ø> (ø)
.-tool-actions-gh-release	19.23% <ø> (ø)
.-tool-actions-plan-preview	25.30% <ø> (ø)
.-tool-codegen-protoc-gen-auth	0.00% <ø> (ø)

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[Warashi]

👍🏻