Enable previously CI-failing test (#2583)

* Enable previously CI-failing test

* Disable max_3d_to_scalar_int32, still failing on CI

* Remove tests

src/ngraph/runtime/cpu/unit_test.manifest

-backwards_maxpool_n2_c1_hw5_3x3_str2_max_pad1x2_2x3
-backwards_batch_norm_training
 shape_of_scalar
 shape_of_vector
 shape_of_matrix
@@ -9,13 +7,6 @@ sum_stable_acc_double
 # failing in CI build but passing on local machine
 max_3d_to_scalar_int32
 
-argmin_trivial_in_i32
-argmax_4D_axis_3_i64_in_i32
-
-# Even after AnyAllReplacement, these trigger an "Unsupported Reduce" error.
-any_2x2x3_eliminate_dims_0_1_2
-all_2x2x3_eliminate_dims_0_1_2
-
 # Not implemented
 erf
 zero_sized_erf