Remove non-implemented test

[kevindiu]

Signed-off-by: kevindiu [email protected]

Description:

This PR remove empty testing stubs, to avoid testing template changes affecting the implementation of empty testing stubs.
The testing stubs which are already implemented will not be removed or updated in this PR, even if it is generated by the legacy testing template.

Since this changes causing a lots of testing file changes, it is very hard to review changes one by one.
Please review by looking at the code coverage changes on
https://app.codecov.io/gh/vdaas/vald/pull/1952

This PR has almost no affect on the code coverage changes, meaning that this PR only remove the empty testing stubs, without removing the implemented tests.

Related Issue:

Versions:

• Go Version: 1.20
• Docker Version: 20.10.8
• Kubernetes Version: 1.22.0
• NGT Version: 2.0.9

Checklist:

• I have read the CONTRIBUTING document and completed our CLA agreement.
• I have checked open Pull Requests for the similar feature or fixes?

Special notes for your reviewer:

[vdaas-ci]

[CHATOPS:HELP] ChatOps commands.

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• ⏪ /rebase - rebase main
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[codecov]

Codecov Report

Base: 50.23% // Head: 29.74% // Decreases project coverage by -20.49% ⚠️

Coverage data is based on head (a5dfbeb) compared to base (97eed29).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1952       +/-   ##
===========================================
- Coverage   50.23%   29.74%   -20.49%     
===========================================
  Files         231      366      +135     
  Lines       13464    34101    +20637     
===========================================
+ Hits         6764    10145     +3381     
- Misses       6499    23549    +17050     
- Partials      201      407      +206     

Impacted Files	Coverage Δ
cmd/agent/core/ngt/main.go	0.00% <ø> (ø)
cmd/agent/sidecar/main.go	0.00% <ø> (ø)
cmd/discoverer/k8s/main.go	0.00% <ø> (ø)
cmd/gateway/filter/main.go	0.00% <ø> (ø)
cmd/gateway/lb/main.go	0.00% <ø> (ø)
cmd/manager/index/main.go	0.00% <ø> (ø)
cmd/tools/cli/loadtest/main.go	0.00% <ø> (ø)
cmd/tools/cli/vdctl/main.go	0.00% <ø> (ø)
internal/observability/metrics/info/info.go	0.00% <0.00%> (-100.00%)	⬇️
internal/errors/ngt.go	70.00% <0.00%> (-19.66%)	⬇️
... and 261 more

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