fix: fix miss makezero bug

[alingse]

What this PR does / why we need it:

Fixes #

I was running github actions to run linter makezero for top github golang repos.

see issues alingse/go-linter-runner#1

and the github actions output

https://github.com/alingse/go-linter-runner/actions/runs/9242655147/job/25425748900

====================================================================================================
append to slice `tags` with non-zero initialized length at https://github.com/m3db/m3/blob/master/src/dbnode/integration/integration_data_verify.go#L241:11
====================================================================================================

but the linter can't find the make(sort.StringSlice, len(*t)) so not reported in the actions output

Special notes for your reviewer

this is not cause a real bad bug because the []string was sort and finally called by WriteString(s)

so the empty value string was save in the slice but ignored when called by WriteString

func (r *result) genID() result {
	tags := make(sort.StringSlice, 0, len(r.Metric))
	for k, v := range r.Metric {
		tags = append(tags, fmt.Sprintf("%s:%s,", k, v))
	}

	sort.Sort(tags)
	var sb strings.Builder
	// NB: this may clash but exact tag values are also checked, and this is a
	// validation endpoint so there's less concern over correctness.
	for _, t := range tags {
		sb.WriteString(t) // this ignore the empty string t
	}

Does this PR introduce a user-facing and/or backwards incompatible change?:

NONE

Does this PR require updating code package or user-facing documentation?:

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