[Vulkan] Fix Ninja build failure by removing wildcard dependencies

[Peddinti-Sriram-Bharadwaj]

Summary

Fixes Ninja build support for the Vulkan backend by removing wildcard usage in DEPENDS.

Fixes #16354
Fixes #14984

The backends/vulkan/cmake/ShaderLibrary.cmake file previously used a wildcard (${shaders_path}/*) in the DEPENDS clause of a custom command. Ninja does not support wildcard expansion in dependencies, which caused the build to fail with:
ninja: error: '.../glsl/*', needed by 'vk_compute_shaders/spv.cpp', missing and no known rule to make it.

This PR replaces the wildcard usage with an explicit file(GLOB ...) command to resolve the source files before passing them to DEPENDS, making the build compatible with the Ninja generator.

Test plan

Verified the fix by rebuilding the Android executor_runner using Ninja:

1. Clean Build: rm -rf cmake-out-android
2. Configure:

   cmake . -G Ninja -DCMAKE_INSTALL_PREFIX=cmake-out-android \
     -DCMAKE_TOOLCHAIN_FILE=$ANDROID_NDK/build/cmake/android.toolchain.cmake \
     -DANDROID_ABI=arm64-v8a \
     -DANDROID_PLATFORM=android-26 \
     -DEXECUTORCH_BUILD_VULKAN=ON \
     -DEXECUTORCH_BUILD_EXTENSION_DATA_LOADER=ON \
     -DEXECUTORCH_BUILD_EXTENSION_MODULE=ON \
     -DEXECUTORCH_BUILD_EXTENSION_TENSOR=ON \
     -DEXECUTORCH_BUILD_EXTENSION_NAMED_DATA_MAP=ON \
     -DEXECUTORCH_BUILD_EXTENSION_LLM=OFF \
     -DPYTHON_EXECUTABLE=$(which python) \
     -Bcmake-out-android

3. Build: ninja -C cmake-out-android -> Success (previously failed).
4. Runtime Verification: Pushed the built executor_runner to an Android device and executed a MobileNetV2 model to ensure the binary loads and runs (confirmed same runtime behavior as the Make build).

cc @SS-JIA @manuelcandales @digantdesai @cbilgin

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16394

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✅ No Failures

As of commit bba1582 with merge base 5a64056 ():
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[Peddinti-Sriram-Bharadwaj]

@pytorchbot label "release notes: build"

[Peddinti-Sriram-Bharadwaj]

@pytorchbot label "release notes: vulkan"