Enable iree-test-deps on macos-14 (#19940)

The CI is green:
https://github.com/iree-org/iree/actions/runs/13248061450

Fixes #19664

---------

Signed-off-by: hanhanW <[email protected]>

Author: hanhanW

.github/workflows/ci_macos_arm64_clang.yml

@@ -54,9 +54,6 @@ jobs:
         # features we use in scripts.
         run: brew install ninja ccache coreutils bash
       - name: "Building IREE"
-        env:
-          # TODO(#19664): Enable building test deps when build errors are fixed.
-          IREE_BUILD_TEST_DEPS: 0
         run: bash ./build_tools/cmake/build_all.sh "${BUILD_DIR}"
 
       - name: Post to Discord on Failure