Handle cleaning up of commandPool which caused memory leak when resizing - #16331
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This fixes a memory leak that happens when resizing a window that uses the SDL renderer with a vulkan backend.
Description
The leak happened due to improperly cleaning up resources within
VULKAN_CreateSwapChain, specifically, it did not destroy thecommandPooland instead only resets it but later creates a new one instead of reusing the old one. This was fixed by changingvkResetCommandPooltovkFreeCommandBuffersand this fixes the memory leak.Existing Issue(s)
Fixes #14973