pkg/cobrautl: replace strings.Replace with strings.ReplaceAll

[bihari123]

Replace deprecated strings.Replace(s, old, new, -1) with the more
modern and readable strings.ReplaceAll(s, old, new).

Also improve readability of commandUsageTemplate initialization
by breaking it into multiple lines.

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

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

Hi @bihari123. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ahrtr]

/ok-to-test

[k8s-ci-robot]

@bihari123: The following test 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-coverage-report	fbef122	link	true	/test pull-etcd-coverage-report

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 69.13%. Comparing base (83b2ba5) to head (fbef122).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/cobrautl/help.go	83.33%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
pkg/cobrautl/help.go	44.44% <83.33%> (+1.96%)	⬆️

... and 18 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #20924      +/-   ##
==========================================
- Coverage   69.21%   69.13%   -0.08%     
==========================================
  Files         422      422              
  Lines       34839    34843       +4     
==========================================
- Hits        24113    24089      -24     
- Misses       9323     9347      +24     
- Partials     1403     1407       +4     

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[serathius]

Please avoid reformatting code unrelated to PR goal.