fix(create-gatsby) the sessionId is supposed to be the same for the whole duration of the session (#28864)

* fix(create-gatsby) the sessionIs is supposed to be the same for the whole duration of the session

* Update packages/create-gatsby/src/tracking.ts

Co-authored-by: Matt Kane <matt@gatsbyjs.com>

Co-authored-by: Matt Kane <matt@gatsbyjs.com>

Author: jamo

packages/create-gatsby/src/tracking.ts

@@ -26,6 +26,8 @@ export interface ITrackCliArgs {
   siteHash?: string
 }
 
+const sessionId = uuidv4()
+
 export const trackCli = (eventType: string, args?: ITrackCliArgs): void => {
   fetch(analyticsApi, {
     method: `POST`,
@@ -36,7 +38,7 @@ export const trackCli = (eventType: string, args?: ITrackCliArgs): void => {
     body: JSON.stringify({
       eventType,
       time: new Date(),
-      sessionId: uuidv4(),
+      sessionId,
       machineId: getMachineId(),
       componentId: `create-gatsby`,
       componentVersion: 1,