Migrating Emoji store to use sqlx (#18301)

* Migrating Emoji store to use sqlx

https://community-daily.mattermost.com/boards/workspace/zyoahc9uapdn3xdptac6jb69ic/285b80a3-257d-41f6-8cf4-ed80ca9d92e5/495cdb4d-c13a-4992-8eb9-80cfee2819a4?c=646cee9a-219c-49f3-8e0b-6ec2cff4deba

```release-note
NONE
```

* Incorporate review suggestions

```release-note
NONE
```

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

store/sqlstore/utils.go

@@ -124,3 +124,11 @@ func constructMySQLJSONArgs(props map[string]string) ([]interface{}, string) {
 
 	return args, argString
 }
+
+func makeStringArgs(params []string) []interface{} {
+	args := make([]interface{}, len(params))
+	for i, name := range params {
+		args[i] = name
+	}
+	return args
+}