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

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

server/channels/store/sqlstore/utils.go

@@ -5,6 +5,7 @@ package sqlstore
 
 import (
 	"database/sql"
+	"errors"
 	"io"
 	"net/url"
 	"strconv"
@@ -206,3 +207,29 @@ func ResetReadTimeout(dataSource string) (string, error) {
 	config.ReadTimeout = 0
 	return config.FormatDSN(), nil
 }
+
+func SanitizeDataSource(driverName, dataSource string) (string, error) {
+	switch driverName {
+	case model.DatabaseDriverPostgres:
+		u, err := url.Parse(dataSource)
+		if err != nil {
+			return "", err
+		}
+		u.User = url.UserPassword("****", "****")
+		params := u.Query()
+		params.Del("user")
+		params.Del("password")
+		u.RawQuery = params.Encode()
+		return u.String(), nil
+	case model.DatabaseDriverMysql:
+		cfg, err := mysql.ParseDSN(dataSource)
+		if err != nil {
+			return "", err
+		}
+		cfg.User = "****"
+		cfg.Passwd = "****"
+		return cfg.FormatDSN(), nil
+	default:
+		return "", errors.New("invalid drivername. Not postgres or mysql.")
+	}
+}