Remove deprecated codestar service (#2754)

* remove deprecated codestar service

* add changelog

* remove deprecated codestar integ tests

---------

Co-authored-by: Tianyi Wang <[email protected]>

Author: wty-Bryant

.changelog/dad3ddc6fde1477babca16e7be7ffe46.json

@@ -0,0 +1,8 @@
+{
+    "id": "dad3ddc6-fde1-477b-abca-16e7be7ffe46",
+    "type": "feature",
+    "description": "Remove deprecated `codestar` service.",
+    "modules": [
+        "."
+    ]
+}