`--disallow-untyped-calls` reports errors in untyped functions

[pranavrajpal]

Bug Report

Using --disallow-untyped-calls and --check-untyped-defs results in errors about calling untyped functions in a typed context, even when calling from an untyped function.

To Reproduce

Test case:

[case testDisallowUntypedCallsFromUntypedFunction]
# flags: --disallow-untyped-calls --check-untyped-defs

def f(x):
    pass

def g(y):
    f(y)

Expected Behavior

Either:

• the documentation and the error message should be updated to specify that --disallow-untyped-calls disallows all calls to untyped functions, regardless of whether the current function has type annotations, or
• the above code shouldn't produce any errors

Actual Behavior

The call to f in the above example produces the error "Call to untyped function "f" in typed context".

Your Environment

See https://mypy-play.net/?mypy=latest&python=3.10&flags=check-untyped-defs%2Cdisallow-untyped-calls&gist=3350fe27968b29dabc5ef1e207d008ce to reproduce.

This came up in #12901 (specifically the mypy_primer diff had an error here)