chore(ci): fix running out of disk

[ludamad]

These runner folders can take up a bunch of room
Also drop some expensive instance types

[github-actions]

Changes to circuit sizes

Generated at commit: ca84cda42cd5ec7a1a74795c33182a7a8aa9028f, compared to commit: bd0ae422e9f1b7e955c9b68b4a5238b248e128d4

🧾 Summary (100% most significant diffs)

Program	ACIR opcodes (+/-)	%	Circuit size (+/-)	%
rollup_base	+9,914 ❌	+5.47%	+29,611 ❌	+1.67%
private_kernel_tail	-2 ✅	-0.00%	-4 ✅	-0.00%
private_kernel_tail_to_public	-4 ✅	-0.00%	-8 ✅	-0.00%
public_kernel_teardown	-160 ✅	-0.07%	-300 ✅	-0.04%
public_kernel_setup	-160 ✅	-0.07%	-300 ✅	-0.04%
public_kernel_app_logic	-200 ✅	-0.08%	-360 ✅	-0.05%
private_kernel_tail_to_public_simulated	0 ➖	0.00%	-4 ✅	-0.11%
public_kernel_app_logic_simulated	0 ➖	0.00%	-4 ✅	-0.11%
public_kernel_setup_simulated	0 ➖	0.00%	-4 ✅	-0.11%
public_kernel_teardown_simulated	0 ➖	0.00%	-4 ✅	-0.11%
public_kernel_tail	-2,126 ✅	-0.21%	-4,928 ✅	-0.13%
private_kernel_tail_simulated	0 ➖	0.00%	-2 ✅	-0.75%
public_kernel_tail_simulated	0 ➖	0.00%	-2 ✅	-0.75%

---

Full diff report 👇

Program	ACIR opcodes (+/-)	%	Circuit size (+/-)	%
rollup_base	191,041 (+9,914)	+5.47%	1,806,511 (+29,611)	+1.67%
private_kernel_tail	195,031 (-2)	-0.00%	1,316,885 (-4)	-0.00%
private_kernel_tail_to_public	621,552 (-4)	-0.00%	2,147,286 (-8)	-0.00%
public_kernel_teardown	223,363 (-160)	-0.07%	667,581 (-300)	-0.04%
public_kernel_setup	223,157 (-160)	-0.07%	667,288 (-300)	-0.04%
public_kernel_app_logic	251,697 (-200)	-0.08%	796,596 (-360)	-0.05%
private_kernel_tail_to_public_simulated	1 (0)	0.00%	3,584 (-4)	-0.11%
public_kernel_app_logic_simulated	1 (0)	0.00%	3,584 (-4)	-0.11%
public_kernel_setup_simulated	1 (0)	0.00%	3,584 (-4)	-0.11%
public_kernel_teardown_simulated	1 (0)	0.00%	3,584 (-4)	-0.11%
public_kernel_tail	1,027,305 (-2,126)	-0.21%	3,704,913 (-4,928)	-0.13%
private_kernel_tail_simulated	1 (0)	0.00%	265 (-2)	-0.75%
public_kernel_tail_simulated	1 (0)	0.00%	265 (-2)	-0.75%