Revert "[CI] Fix docker builds failing due to cmake update by setting CMAKE_POLICY_VERSION_MINIMUM (#150220)"

This reverts commit 87549a65c9.

Reverted https://github.com/pytorch/pytorch/pull/150220 on behalf of https://github.com/clee2000 due to doesn't solve the problem since the installed cmake 4 stays on the system, resulting in failed pytorch builds later ([comment](https://github.com/pytorch/pytorch/pull/150220#issuecomment-2762623078))

.ci/docker/common/install_executorch.sh

@@ -37,8 +37,7 @@ install_conda_dependencies() {
 
 install_pip_dependencies() {
   pushd executorch
-  # Remove CMAKE_POLICY_VERSION_MINIMUM when cmake 4.0.0 is more supported
-  as_jenkins CMAKE_POLICY_VERSION_MINIMUM=3.5 bash install_executorch.sh
+  as_jenkins bash install_executorch.sh
 
   # A workaround, ExecuTorch has moved to numpy 2.0 which is not compatible with the current
   # numba and scipy version used in PyTorch CI

.ci/docker/common/install_halide.sh

@@ -19,9 +19,6 @@ fi
 
 conda_install numpy scipy imageio cmake ninja
 
-# Remove this when cmake 4.0.0 is more supported
-export CMAKE_POLICY_VERSION_MINIMUM=3.5
-
 git clone --depth 1 --branch release/16.x --recursive https://github.com/llvm/llvm-project.git
 cmake -DCMAKE_BUILD_TYPE=Release \
         -DLLVM_ENABLE_PROJECTS="clang" \