Move snapshot decoder replay into VkDecoderGlobalState

... to break the recursive behavior of the replay calling into
VkDecoderSnapshot so that locking and thread safety annotations can be
preserved in VkDecoderSnapshot.

Follow up to aosp/3412302.

Bug: b/383139165
Test: cvd create --gpu_mode=gfxstream_guest_angle_host_swiftshader
Test: cvd snapshot_take --snapshot_path=<>
Test: cvd create --snapshot_path=<>
Change-Id: I69cc96bca3d05b49555e342298a73a209695ecb6