chore: switch to btreeset for deterministic ordering #14498

Job	Run time
build-acvm-js	1m 26s
build-nargo	2m 26s
build-noirc-abi	1m 33s
build-noir-wasm	3m 52s
ACVM JS (Browser)	1m 44s
ACVM JS (Node.js)	38s
noirc_abi	1m 21s
noir_codegen	1m 14s
Example scripts	12s
Noir JS	1m 4s
Check external repo - ${{ matrix.project.repo }}	0s
Integration Tests (Browser)	2m 13s
Integration Tests (Node)	2m 20s
noir_wasm	1m 26s
End	1s
	21m 30s

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