extract description message into constant

Author: michelle0927

components/slack_bot/common/utils.mjs

@@ -1,5 +1,7 @@
 import app from "../slack_bot.app.mjs";
 
+const CONVERSATION_PERMISSION_MESSAGE = "In order to list a Slack channel, **your bot must be a member of that channel**, and in order to list private channels, your bot must have the `groups:read` scope in the `OAuth & Permissions` settings in Slack for this bot.";
+
 async function streamIterator(stream) {
   let resources = [];
   for await (const resource of stream) {
@@ -24,10 +26,9 @@ function buildPropDefinitions({
       }
 
       if (key === "conversation") {
-        const message = "In order to list a Slack channel, **your bot must be a member of that channel**, and in order to list private channels, your bot must have the `groups:read` scope in the `OAuth & Permissions` settings in Slack for this bot.";
         prop.description = prop.description
-          ? `${prop.description} ${message}`
-          : `Select a public or private channel, or a user or group. ${message}`;
+          ? `${prop.description} ${CONVERSATION_PERMISSION_MESSAGE}`
+          : `Select a public or private channel, or a user or group. ${CONVERSATION_PERMISSION_MESSAGE}`;
       }
 
       const [