[chore] remove unused func (open-telemetry#21495)

This removes an unused fun introduced in open-telemetry#21153

Signed-off-by: Alex Boten <[email protected]>

cmd/mdatagen/main.go

@@ -24,7 +24,6 @@ import (
  "os"
  "path/filepath"
  "regexp"
- "sort"
  "strings"
  "text/template"
 
@@ -132,16 +131,6 @@ func templatize(tmplFile string, md metadata) *template.Template {
  "distroURL": func(name string) string {
  return distros[name]
  },
- "keys": func(input map[string]string) []string {
- keys := []string{}
- for k := range input {
- keys = append(keys, k)
- }
- sort.Slice(keys, func(i, j int) bool {
- return keys[i] > keys[j]
- })
- return keys
- },
  // ParseFS delegates the parsing of the files to `Glob`
  // which uses the `\` as a special character.
  // Meaning on windows based machines, the `\` needs to be replaced