MM-51768: Scrub username/password from SQL datasource (#22731)

https://mattermost.atlassian.net/browse/MM-51768
```release-note
NONE
```

server/config/utils.go

@@ -179,27 +179,6 @@ func IsDatabaseDSN(dsn string) bool {
 		strings.HasPrefix(dsn, "postgresql://")
 }
 
-// stripPassword remove the password from a given DSN
-func stripPassword(dsn, schema string) string {
-	prefix := schema + "://"
-	dsn = strings.TrimPrefix(dsn, prefix)
-
-	i := strings.Index(dsn, ":")
-	j := strings.LastIndex(dsn, "@")
-
-	// Return error if no @ sign is found
-	if j < 0 {
-		return "(omitted due to error parsing the DSN)"
-	}
-
-	// Return back the input if no password is found
-	if i < 0 || i > j {
-		return prefix + dsn
-	}
-
-	return prefix + dsn[:i+1] + dsn[j:]
-}
-
 func isJSONMap(data string) bool {
 	var m map[string]any
 	return json.Unmarshal([]byte(data), &m) == nil