[Outlook integration] part 2 : GetMessages (#9612)

### Introducing

- mock files in order to setup unit test on parsing outlook messages
- special spec files for development purposes : dev.spec files. They are
CI skipped with xdescribe but very useful for iterating on new messages
format
- main functionality : getMessages. We use microsoft default client to
do so, using the $batch endpoint to group calls by 20

### documentation
final touch to add troubleshooting tips

packages/twenty-website/src/content/developers/self-hosting/setup.mdx

@@ -61,6 +61,10 @@ yarn command:prod cron:calendar:ongoing-stale
 
 ## For Outlook and Outlook Calendar (Microsoft 365)
 
+<ArticleWarning>
+Users must have a [Microsoft 365 Licence](https://admin.microsoft.com/Adminportal/Home) to be able to use the Calendar and Messaging API. They will not be able to sync their account on Twenty without one.
+</ArticleWarning>
+
 ### Create a project in Microsoft Azure
 
 You will need to create a project in [Microsoft Azure](https://portal.azure.com/#view/Microsoft_AAD_IAM/AppGalleryBladeV2) and get the credentials.

packages/twenty-website/src/content/developers/self-hosting/troubleshooting.mdx

@@ -70,6 +70,10 @@ Most of the time, it's because the `worker` is not running in the background. Tr
 npx nx worker twenty-server
 ```
 
+#### Cannot connect my Microsoft 365 account
+
+Most of the time, it's because your admin has not enabled the Microsoft 365 Licence for your account. Check [https://admin.microsoft.com/](https://admin.microsoft.com/Adminportal/Home).
+
 #### While running `yarn` warnings appear in console
 
 Warnings are informing about pulling additional dependencies which aren't explicitly stated in `package.json`, so as long as no breaking error appears, everything should work as expected.