feat: optimize constraints in sha256 (#6145) #13289

Job	Run time
build-nargo	2m 49s
build-noirc-abi	1m 34s
build-acvm-js	1m 31s
build-noir-wasm	4m 9s
ACVM JS (Node.js)	42s
ACVM JS (Browser)	1m 35s
noirc_abi	1m 41s
Example scripts	13s
noir_codegen	1m 1s
Noir JS	1m 13s
Check external repo - ${{ matrix.project.repo }}	0s
Integration Tests (Browser)	2m 24s
noir_wasm	2m 20s
Integration Tests (Node)	2m 34s
End	1s
	23m 47s

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