Add support for unsigned types with mlir (#3582) #21673

Job	Run time
Check if image exists in registry	7s
cancel	4s
pyflakes	3m 2s
licensing	3m 23s
linux (ubuntu-20.04, debug)	1h 33m 49s
linux-fpga (ubuntu-20.04, debug)	1h 36m 5s
linux (ubuntu-20.04, release)	1h 33m 48s
linux (ubuntu-20.04, codecov)	1h 32m 35s
Build image	0s
Build SLES image	0s
tidy	45m 17s
format	4m 59s
cppcheck	51m 33s
sles	34m 7s
	8h 38m 49s

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