[Synapse] Generate Azure.Analytics.Synapse.Spark preview.8 (Azure#24315)

* [Synapse] - SparkBatchOperation should not return when state is starting

* Support both job submission and job execution scenarios

* Update export api

* Fix a few comments

* Save current status

* Add test cases

* Add file comment

* Refresh session records

* Resolve conflicts

* update exported API

* Regenerate code

* Update session records

* Add public constructors for operations

* generate from swagger

* update api listing

* update changelog

* Update sdk/synapse/Azure.Analytics.Synapse.Spark/CHANGELOG.md

Co-authored-by: Christopher Scott <chriscott@hotmail.com>

Co-authored-by: Dongwei Wang <dongwwa@microsoft.com>
Co-authored-by: Christopher Scott <chriscott@hotmail.com>

Author: 3 people

sdk/synapse/Azure.Analytics.Synapse.Spark/CHANGELOG.md

@@ -1,15 +1,11 @@
 # Release History
 
-## 1.0.0-preview.8 (Unreleased)
+## 1.0.0-preview.8 (2021-10-05)
 
 ### Features Added
 - Enhance Long Running Operation (LRO) logic for `SparkBatchClient` to support both scenarios of job submission and job execution.
+- Update `LivyState` to be an extensible enum.
 
-### Breaking Changes
-
-### Bugs Fixed
-
-### Other Changes
 
 ## 1.0.0-preview.7 (2021-08-10)