proxy/sentry: fix exhaustive lint error in truncateValue

[Copilot]

The exhaustive linter rejected the switch rv.Kind() inside truncateValue because it requires all 26 reflect.Kind values to be explicitly listed as cases.

Change

Replace the inner switch rv.Kind() with if/else comparisons — same logic, no enum exhaustiveness requirement:

// before
switch rv.Kind() {
case reflect.Slice, reflect.Array:
    return formatSliceValue(rv, maxSentryValueLen)
case reflect.Map:
    return formatMapValue(rv, maxSentryValueLen)
default:
    return truncateString(fmt.Sprintf("%v", v))
}

// after
kind := rv.Kind()
if kind == reflect.Slice || kind == reflect.Array {
    return formatSliceValue(rv, maxSentryValueLen)
} else if kind == reflect.Map {
    return formatMapValue(rv, maxSentryValueLen)
}
return truncateString(fmt.Sprintf("%v", v))

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[github-actions]

🚫 [golangci] _{reported by reviewdog 🐶}
QF1003: could use tagged switch on kind (staticcheck)