Only package external extensions on Linux in the pipelines (#8464)

* don't package every time, only on linux

* fix build

* fix build

* fix floating promises

* add comment

* fix order of steps

* clean up packaging of the extensions

* minor cleanup

* make code easier to read and add more logging

* do some rename

* maybe?

* re order the code

* fix output path not existing

build/azure-pipelines/darwin/sql-product-build-darwin.yml

@@ -65,13 +65,13 @@ steps:
 
   - script: |
       set -e
-      yarn gulp vscode-darwin
-    displayName: Build
+      yarn gulp install-sqltoolsservice
+    displayName: Install sqltoolsservice
 
   - script: |
       set -e
-      yarn gulp install-sqltoolsservice
-    displayName: Install sqltoolsservice
+      yarn gulp vscode-darwin
+    displayName: Build
 
   - task: ArchiveFiles@2 # WHY ARE WE DOING THIS?
     displayName: 'Archive build scripts source'