[ET-VK] De vectorizing sum and moving bias application to the end in conv 2d op to improve performance.

[trivedivivek]

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This diff optimizes the conv 2d op in the Vulkan runtime by de-vectorizing the sum and moving the bias application to the end.

Differential Revision: D75551846

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Looks like this PR hasn't been updated in a while so we're going to go ahead and mark this as Stale.
Feel free to remove the Stale label if you feel this was a mistake.
If you are unable to remove the Stale label please contact a maintainer in order to do so.
If you want the bot to never mark this PR stale again, add the no-stale label.
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