Remove test_tool workflow

[khanhtc1202]

What this PR does:

as title

Why we need it:

The test for the tools' modules is covered by the test workflow

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 28.67%. Comparing base (0501f16) to head (bab9072).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6141   +/-   ##
=======================================
  Coverage   28.67%   28.67%           
=======================================
  Files         535      535           
  Lines       57335    57335           
=======================================
  Hits        16442    16442           
  Misses      39615    39615           
  Partials     1278     1278           

Flag	Coverage Δ
.	23.27% <ø> (ø)
.-pkg-app-pipedv1-plugin-analysis	62.85% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes	62.30% <ø> (ø)
.-pkg-app-pipedv1-plugin-kubernetes_multicluster	67.48% <ø> (ø)
.-pkg-app-pipedv1-plugin-scriptrun	54.83% <ø> (ø)
.-pkg-app-pipedv1-plugin-terraform	38.31% <ø> (ø)
.-pkg-app-pipedv1-plugin-wait	35.51% <ø> (ø)
.-pkg-app-pipedv1-plugin-waitapproval	68.62% <ø> (ø)
.-pkg-plugin-sdk	50.98% <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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[ffjlabo]

Seems good

noted the current target module for test.yaml by using the command here

% find . -name go.mod -exec dirname {} \; | sort | jq -R -s -c 'split("\n") | map(select(length > 0))'
[".","./pkg/app/pipedv1/plugin/analysis","./pkg/app/pipedv1/plugin/cloudrun","./pkg/app/pipedv1/plugin/kubernetes","./pkg/app/pipedv1/plugin/kubernetes_multicluster","./pkg/app/pipedv1/plugin/scriptrun","./pkg/app/pipedv1/plugin/terraform","./pkg/app/pipedv1/plugin/wait","./pkg/app/pipedv1/plugin/waitapproval","./pkg/plugin/sdk","./tool/actions-gh-release","./tool/actions-plan-preview","./tool/codegen/protoc-gen-auth"]