Disable old fee extensions in non-prod envs (#2933)

The primary annoyance with this is that it means we need (or at least,
should) split all tests that use the fee extension into two separate
tests -- one that simulates non-prod environments, and one that
simulates prod environments. This leads to duplication of many tests but
that's fine since this is theoretically temporary.

config/presubmits.py

@@ -98,8 +98,8 @@ PRESUBMITS = {
         "File did not include the license header.",
 
     # Files must end in a newline
-    PresubmitCheck(r".*\n$", ("java", "js", "soy", "sql", "py", "sh", "gradle", "ts"),
-                   {"node_modules/"}, REQUIRED):
+    PresubmitCheck(r".*\n$", ("java", "js", "soy", "sql", "py", "sh", "gradle", "ts", "xml"),
+                   {"node_modules/", ".idea"}, REQUIRED):
         "Source files must end in a newline.",
 
     # System.(out|err).println should only appear in tools/ or load-testing/