fix: Do not duplicate constant arrays in brillig

[sirasistant]

Description

Problem*

Avoids array duplication in inserter for brillig runtimes.

Summary*

After #6122 the inhibitor in the deduplication process for brillig should not be necessary anymore.

Additional Context

Documentation*

Check one:

• No documentation needed.
• Documentation included in this PR.
• [For Experimental Features] Documentation to be submitted in a separate PR.

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.

[github-actions]

Changes to Brillig bytecode sizes

Generated at commit: 8162f413207e1d81e4d926e4e5efd4b5d888602f, compared to commit: bcb438b0816fbe08344535545612d32b4730af79

🧾 Summary (10% most significant diffs)

Program	Brillig opcodes (+/-)	%
eddsa	-5,302 ✅	-31.26%
brillig_nested_arrays	-202 ✅	-37.69%
strings	-655 ✅	-41.22%
bigint	-1,789 ✅	-45.26%
debug_logs	-4,854 ✅	-48.87%
slice_regex	-3,332 ✅	-52.65%
cast_and_shift_global	-107 ✅	-65.24%

---

Full diff report 👇

Program	Brillig opcodes (+/-)	%
brillig_rc_regression_6123	193 (+9)	+4.89%
regression_struct_array_conditional	688 (-2)	-0.29%
struct_inputs	302 (-6)	-1.95%
conditional_1	1,286 (-28)	-2.13%
brillig_cow_regression	2,037 (-56)	-2.68%
array_dynamic_nested_blackbox_input	1,008 (-28)	-2.70%
ecdsa_secp256k1	978 (-28)	-2.78%
aes128_encrypt	483 (-14)	-2.82%
fold_numeric_generic_poseidon	745 (-22)	-2.87%
no_predicates_numeric_generic_poseidon	745 (-22)	-2.87%
poseidon_bn254_hash_width_3	5,727 (-173)	-2.93%
poseidon_bn254_hash	5,727 (-173)	-2.93%
schnorr	913 (-31)	-3.28%
nested_array_dynamic	2,746 (-99)	-3.48%
brillig_sha256	762 (-28)	-3.54%
poseidonsponge_x5_254	4,499 (-186)	-3.97%
brillig_oracle	331 (-14)	-4.06%
array_dynamic_blackbox_input	1,179 (-56)	-4.53%
u128	3,155 (-154)	-4.65%
regression_5252	5,369 (-263)	-4.67%
regression_4449	824 (-42)	-4.85%
fold_complex_outputs	917 (-50)	-5.17%
7_function	582 (-34)	-5.52%
fold_2_to_17	567 (-35)	-5.81%
array_to_slice	975 (-65)	-6.25%
uhashmap	24,625 (-1,754)	-6.65%
references	267 (-22)	-7.61%
modulus	1,744 (-148)	-7.82%
sha256_regression	7,054 (-609)	-7.95%
nested_array_in_slice	1,377 (-121)	-8.08%
brillig_pedersen	203 (-18)	-8.14%
pedersen_check	203 (-18)	-8.14%
merkle_insert	739 (-66)	-8.20%
sha256_var_witness_const_regression	1,320 (-119)	-8.27%
brillig_keccak	1,777 (-177)	-9.06%
keccak256	1,777 (-177)	-9.06%
conditional_regression_short_circuit	1,370 (-137)	-9.09%
sha256_var_size_regression	1,978 (-222)	-10.09%
6	1,808 (-203)	-10.09%
sha256	1,927 (-228)	-10.58%
sha2_byte	3,263 (-425)	-11.52%
hashmap	28,196 (-4,277)	-13.17%
slices	2,150 (-392)	-15.42%
side_effects_constrain_array	114 (-24)	-17.39%
brillig_slices	491 (-112)	-18.57%
eddsa	11,659 (-5,302)	-31.26%
brillig_nested_arrays	334 (-202)	-37.69%
strings	934 (-655)	-41.22%
bigint	2,164 (-1,789)	-45.26%
debug_logs	5,079 (-4,854)	-48.87%
slice_regex	2,997 (-3,332)	-52.65%
cast_and_shift_global	57 (-107)	-65.24%