Release 3.0.0 resetting files that were not needed

Author: drache42

.gitignore

@@ -184,4 +184,8 @@ UpgradeLog.htm
 /src/Documentation/_python
 /src/Python/Documentation/generated
 /tests/Python.TestApplication/manifest.json
+/.git2gus
+/src/Python/scripts/publish-package.ps1
 
+# Public repo ignores
+.github/pull_request_template.md

CODEOWNERS

@@ -1,3 +1,2 @@
-#GUSINFO: gus_team_id,product_tag_id 
-#GUSINFO: a00EE00000glzJCYAY,a1aEE000000JtTpYAK
-* @tableau/migration
+# Comment line immediately above ownership line is reserved for related other information. Please be careful while editing.
+#ECCN:Open Source 5D002