[ET-VK] Reducing memory wastage by tightening DescriptorPoolConfig values.

[trivedivivek]

Stack from ghstack (oldest at bottom):

• [ET-VK] Return fence after waiting is done. #10787
• [ET-VK] Moving device capabilities check to DispatchNode and PrepackNode ctor. #10785
• -> [ET-VK] Reducing memory wastage by tightening DescriptorPoolConfig values. #10784
• [ET-VK] Removing descriptor pool intialization from DescriptorPool ctor. #10777

This change replaces std::max(descriptor_type_count, max_sets) with descriptor_type_count, when creating DescriptorPoolConfig in ComputeGraph since Vulkan does not need to have at least one of each descriptor_type_count per set.

Differential Revision: D74452971

[pytorch-bot]

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❌ 6 New Failures

As of commit 39e8488 with merge base 277c39d ():

NEW FAILURES - The following jobs have failed:

• pull / test-models-linux (llama3_2_vision_encoder, portable, linux.4xlarge.memory) / linux-job (gh)
  RuntimeError: Command docker exec -t 077339dfbe371bf1efe83844afc249f3676ec128787f41232ab95c50c5e75910 /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 920f413921041af9febd658c2647d0fdd8e38c4fa25407574edc19fc55480012 /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t 97fd082e125908d8a22584110b307c2c02c2806763bea4ecb33dec79ff539e50 /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 17f28a0616b24ecfcbc2b7814125f77c2e08b28d607a1cc46d0a9fa31d4fb5a7 /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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This pull request was exported from Phabricator. Differential Revision: D74452971

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