Add optional export notifications (#3935)

* Add `emails.export_completed` notification to settings menu

Signed-off-by: AKP <tom@tdpain.net>

* Don't send email when export_completed notifications are disabled

Signed-off-by: AKP <tom@tdpain.net>

* Automatically subscribe new users to `export_completed` notifications

Signed-off-by: AKP <tom@tdpain.net>

* Alter secondary text on export page to mention optional notifications

Signed-off-by: AKP <tom@tdpain.net>

* Alter toast text on collection export for optional notifications

Signed-off-by: AKP <tom@tdpain.net>

* Only subscribe new admins to export notifs

Signed-off-by: AKP <tom@tdpain.net>

* Move `export_completed` notification decision into `beforeSend`

Signed-off-by: AKP <tom@tdpain.net>

* Update server/emails/templates/ExportFailureEmail.tsx

Co-authored-by: Tom Moor <tom.moor@gmail.com>

* Update server/emails/templates/ExportSuccessEmail.tsx

Co-authored-by: Tom Moor <tom.moor@gmail.com>

Signed-off-by: AKP <tom@tdpain.net>
Co-authored-by: Tom Moor <tom.moor@gmail.com>

server/queues/tasks/ExportMarkdownZipTask.ts

@@ -72,8 +72,10 @@ export default class ExportMarkdownZipTask extends BaseTask<Props> {
 
       await ExportSuccessEmail.schedule({
         to: user.email,
+        userId: user.id,
         id: fileOperation.id,
         teamUrl: team.url,
+        teamId: team.id,
       });
     } catch (error) {
       await this.updateFileOperation(fileOperation, {
@@ -82,7 +84,9 @@ export default class ExportMarkdownZipTask extends BaseTask<Props> {
       });
       await ExportFailureEmail.schedule({
         to: user.email,
+        userId: user.id,
         teamUrl: team.url,
+        teamId: team.id,
       });
       throw error;
     }