[ET-VK] Delete empty file StringUtil.cpp

[junpi3]

Stack from ghstack (oldest at bottom):

• [ET-VK] Order stdlib includes after ET includes #4127
• [ET-VK] Move files using the Vulkan API to vk_api/ #4125
• [ET-VK] Move Tensor.* to namespace api #4124
• [ET-VK] Organize StringUtil.h and Utils.h into utils/ and VkUtils.h #4123
• [ET-VK] Shorten namespace api::utils to utils #4122
• [ET-VK] Move gen_vulkan_spv.py out of api/ #4121
• [ET-VK] Move ParamsBuffer and StorageBuffer to standalone files #4120
• [ET-VK] Move ParamsBindList to Descriptor.* #4119
• [ET-VK] Delete unused functions in Adapter.* #4118
• [ET-VK] Delete unused functions in Context.h, Command.h and Utils.h #4117
• [ET-VK] Delete unused function in Types.h #4116
• -> [ET-VK] Delete empty file StringUtil.cpp #4115

TSIA

Differential Revision: D59281546

[pytorch-bot]

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 3bb0012 with merge base c572f9e ():

NEW FAILURE - The following job has failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for backends/cadence/CMakeLists.txt:

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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This pull request was exported from Phabricator. Differential Revision: D59281546

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This pull request has been merged in 5bcb28e.