chore(ci): run l1-contracts CI in parallel with build step

[TomAFrench]

There's no real reason to wait until the build step has completed to run the l1-contracts tests afaict as the build step doesn't impact l1-contracts.

[github-actions]

Changes to public function bytecode sizes

Generated at commit: 80f93b8a8c798bb468de178895d0a2f99dbc92a4, compared to commit: 44ea5fbccc944a609cce7fd2a488c63ec2ed5169

🧾 Summary (100% most significant diffs)

Program	Bytecode size in bytes (+/-)	%
Test::create_l2_to_l1_message_public	+160 ❌	+7.84%
AvmTest::pedersen_hash	+160 ❌	+5.45%
AvmTest::pedersen_hash_with_index	+160 ❌	+5.45%
CardGame::start_game	+200 ❌	+2.87%
CardGame::public_dispatch	+400 ❌	+2.46%
Test::consume_message_from_arbitrary_sender_public	+160 ❌	+2.01%
CardGame::on_cards_claimed	+120 ❌	+1.64%
Test::consume_mint_to_public_message	+180 ❌	+1.62%
AvmTest::pedersen_commit	+20 ❌	+1.62%
Test::public_dispatch	+300 ❌	+1.47%
TokenBridge::claim_public	+180 ❌	+1.39%
AvmTest::bulk_testing	+280 ❌	+1.18%
Uniswap::swap_public	+180 ❌	+1.14%
TestLog::emit_unencrypted_events	+20 ❌	+1.07%
TokenBridge::exit_to_l1_public	+80 ❌	+1.00%
TokenBridge::public_dispatch	+220 ❌	+0.99%
CardGame::on_game_joined	+40 ❌	+0.79%
AvmTest::keccak_hash	+20 ❌	+0.73%
Uniswap::public_dispatch	+180 ❌	+0.72%
CardGame::on_card_played	+40 ❌	+0.67%
AvmTest::public_dispatch	+380 ❌	+0.62%
AvmTest::sha256_hash	+20 ❌	+0.51%

---

Full diff report 👇

Program	Bytecode size in bytes (+/-)	%
Test::create_l2_to_l1_message_public	2,202 (+160)	+7.84%
AvmTest::pedersen_hash	3,095 (+160)	+5.45%
AvmTest::pedersen_hash_with_index	3,095 (+160)	+5.45%
CardGame::start_game	7,165 (+200)	+2.87%
CardGame::public_dispatch	16,643 (+400)	+2.46%
Test::consume_message_from_arbitrary_sender_public	8,137 (+160)	+2.01%
CardGame::on_cards_claimed	7,458 (+120)	+1.64%
Test::consume_mint_to_public_message	11,284 (+180)	+1.62%
AvmTest::pedersen_commit	1,255 (+20)	+1.62%
Test::public_dispatch	20,664 (+300)	+1.47%
TokenBridge::claim_public	13,136 (+180)	+1.39%
AvmTest::bulk_testing	24,075 (+280)	+1.18%
Uniswap::swap_public	15,903 (+180)	+1.14%
TestLog::emit_unencrypted_events	1,885 (+20)	+1.07%
TokenBridge::exit_to_l1_public	8,076 (+80)	+1.00%
TokenBridge::public_dispatch	22,412 (+220)	+0.99%
CardGame::on_game_joined	5,086 (+40)	+0.79%
AvmTest::keccak_hash	2,769 (+20)	+0.73%
Uniswap::public_dispatch	25,256 (+180)	+0.72%
CardGame::on_card_played	5,987 (+40)	+0.67%
AvmTest::public_dispatch	61,741 (+380)	+0.62%
AvmTest::sha256_hash	3,910 (+20)	+0.51%