Rename AbstractFFTsTestUtilsExt.jl to AbstractFFTsTestExt.jl

Author: gaurav-arya

ext/AbstractFFTsTestUtilsExt.jl renamed to ext/AbstractFFTsTestExt.jl

@@ -1,6 +1,6 @@
 # This file contains code that was formerly part of Julia. License is MIT: https://julialang.org/license
 
-module AbstractFFTsTestUtilsExt
+module AbstractFFTsTestExt
 
 using AbstractFFTs
 using AbstractFFTs: TestUtils
@@ -236,4 +236,4 @@ function TestUtils.test_real_fft(ArrayType=Array; test_inplace=true, test_adjoin
     end
 end
 
-end
+end