Move ignore missing imports to ignore globally

mypy.ini

@@ -2,6 +2,7 @@
 files = python, tests, config
 warn_unused_configs = False
 warn_redundant_casts = False
+ignore_missing_imports = True
 plugins = pydantic.mypy
 
 [mypy-astropy.*]
@@ -86,7 +87,6 @@ ignore_errors = True
 
 # Check all of summit_utils...
 [mypy-lsst.summit.utils.*]
-ignore_missing_imports = True
 ignore_errors = False
 disallow_untyped_defs = False
 disallow_incomplete_defs = False