change package name for tools and remove unnecessary doc.go

[ahrtr]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

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@ahrtr: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-verify	4b9b382	link	true	/test pull-etcd-verify
pull-etcd-unit-test-386	4b9b382	link	true	/test pull-etcd-unit-test-386
pull-etcd-unit-test-arm64	4b9b382	link	true	/test pull-etcd-unit-test-arm64
pull-etcd-unit-test-amd64	4b9b382	link	true	/test pull-etcd-unit-test-amd64

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[ahrtr]

The libs.go and tools.go have build constraint like //go:build tools, so the pull-etcd-verify still complains context loading failed: no go files to analyze even after changing the packages.

https://prow.k8s.io/view/gs/kubernetes-jenkins/pr-logs/pull/etcd-io_etcd/18607/pull-etcd-verify/1836702520009822208

So we can't remove the doc.go file.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.75%. Comparing base (9fc3b2a) to head (b3ba130).

❗ Current head b3ba130 differs from pull request most recent head 4b9b382

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Additional details and impacted files

see 16 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18607      +/-   ##
==========================================
- Coverage   68.79%   68.75%   -0.05%     
==========================================
  Files         420      420              
  Lines       35519    35519              
==========================================
- Hits        24437    24422      -15     
- Misses       9655     9670      +15     
  Partials     1427     1427              

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