[ET-VK] Removing descriptor pool intialization from DescriptorPool ctor.

[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

Descriptor pool is initialized with proper capacity while ComputeGraph is build, in ComputeGraph::prepare function.
Thus, initializing descriptor pool in constructor just add throwaway work.

Differential Revision: D74347030

[pytorch-bot]

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❌ 7 New Failures

As of commit fb621e6 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 ab83deea57df1f283c7e9c95f31a3112148ce442346a0e7d6cd59b0d2ef907ec /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 084b091c57eed37c37e4dc56c1d93a26649b147f061dde166bb1e140611474ec /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 2a345f3c7d0fdb5899c968f13e14406c646a753d26ae53c39b02143805c526b7 /exec failed with exit code 1
• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t 7203c8005859974ef1cf3ab6de2f3d6b9160f03e547bf444250533eca0f6555e /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t e3396f29f425f4a5fbaec1b0abb8f39dcf418f592813682ca8fa192316d071ca /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: D74347030

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This pull request was exported from Phabricator. Differential Revision: D74347030

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