[ET-VK] Moving device capabilities check to DispatchNode and PrepackNode ctor.

[trviv]

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

The changes in this diff move the device capabilities check from the encode method to the constructor of DispatchNode and PrepackNode classes.

Differential Revision: D74481839

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• pull / unittest / linux / linux-job (gh)
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• pull / unittest-editable / macos / macos-job (gh)
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