Add pass to convert Uint8 to int8 across operators #20427

Job	Run time
pyflakes	3m 8s
Check if image exists in registry	5s
cancel	4s
licensing	3m 34s
linux (ubuntu-20.04, debug)	1h 23m 25s
linux-fpga (ubuntu-20.04, debug)	2h 1m 45s
linux (ubuntu-20.04, release)	1h 23m 23s
linux (ubuntu-20.04, codecov)	1h 20m 53s
Build SLES image	0s
Build image	0s
sles	30m 10s
cppcheck	51m 7s
tidy	1h 32m 11s
format	5m 15s
	9h 15m 0s

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