enacted deprecation for dispatch-packages, cleaned up deprecations te… (

#3975)

* enacted deprecation for dispatch-packages, cleaned up deprecations tests for unused macros/models. still need to clean up unused code.

* more work to catch packages use

* fixed tests for removing packages on adapter.dispatch.

* cleaned out folder for 012_deprecation_tests to remove unused models/data/macros

* removed obsolete code due to patching for packages arg in adapter.dispatch

* updated exception name

* added deprecation change to changelog.

automatic commit by git-black, original commits:
  3caec08

core/dbt/clients/jinja_static.py

@@ -111,7 +111,7 @@ def statically_parse_adapter_dispatch(func_call, ctx, db_wrapper):
     # keyword arguments
     if func_call.kwargs:
         for kwarg in func_call.kwargs:
-            if kwarg.key == 'macro_name':
+            if kwarg.key == "macro_name":
                 # This will remain to enable static resolution
                 if type(kwarg.value).__name__ == "Const":
                     func_name = kwarg.value.value

core/dbt/context/providers.py

@@ -129,7 +129,7 @@ def dispatch(
         search_packages: List[Optional[str]]
 
         if '.' in macro_name:
-            suggest_macro_namespace, suggest_macro_name = macro_name.split('.', 1)
+            suggest_macro_namespace, suggest_macro_name = macro_name.split(".", 1)
             msg = (
                 f'In adapter.dispatch, got a macro name of "{macro_name}", '
                 f'but "." is not a valid macro name component. Did you mean '
@@ -152,7 +152,7 @@ def dispatch(
         else:
             # Not a string and not None so must be a list
             raise CompilationException(
-                f'In adapter.dispatch, got a list macro_namespace argument '
+                f"In adapter.dispatch, got a list macro_namespace argument "
                 f'("{macro_namespace}"), but macro_namespace should be None or a string.'
             )
 

core/dbt/exceptions.py

@@ -674,7 +674,7 @@ def macro_not_found(model, target_macro_id):
 
 
 def macro_invalid_dispatch_arg(macro_name) -> NoReturn:
-    msg = '''\
+    msg = """\
     The "packages" argument of adapter.dispatch() has been deprecated.
     Use the "macro_namespace" argument instead.
 
@@ -683,7 +683,7 @@ def macro_invalid_dispatch_arg(macro_name) -> NoReturn:
     For more information, see:
 
     https://docs.getdbt.com/reference/dbt-jinja-functions/dispatch
-    '''
+    """
     raise_compiler_error(msg.format(macro_name))