Fix go generator undefined Package name, also throwing exception (#7632)

* Fix go generator undefined Package, also throw exception in specific examples.

* Add test for go generator import problem

* Add new version of generated go file. Fix conflict.

* Add executable permission to generate_code.py script.

* Improve test quality, remove unwanted generated files, better naming

* Fix comments

* clang format

Co-authored-by: Derek Bailey <derekbailey@google.com>

scripts/generate_code.py

@@ -193,6 +193,20 @@ flatc(
     include="include_test",
 )
 
+flatc(
+    NO_INCL_OPTS
+    + ["--go"],
+    schema="include_test/foo.fbs",
+    include="include_test/sub",
+)
+
+flatc(
+    NO_INCL_OPTS
+    + ["--go"],
+    schema="include_test/sub/header.fbs",
+    include="include_test",
+)
+
 flatc(
     NO_INCL_OPTS
     + TS_OPTS,