ci: run tests with optimizations

[Oppen]

This saves a lot of execution time and, in the case of coverage builds, disk space. O2 seems to give good results, so I'm going with it. Local tests on a development machine:

PROFILE	BUILD TIME	RUN TIME	COV ARTIFACTS
NONE	61s	112s	N/A
O1	193s	16s	N/A
O2	190s	13s	N/A
O3	192s	12s	N/A
Os	126s	14s	N/A
Oz	138s	21s	N/A
COV	68s	451s	90GB
COV+O1	182s	130s	93GB
COV+O2	204s	95s	69GB
COV+O3	208s	98s	69GB
COV+Os	180s	131s	93GB
COV+Oz	157s	140s	93GB

On CI first run (invalidated cache) tests take about 9-10 minutes per shard. This seems stable too afterwards, which makes sense since most time seems to be spent linking the binaries rather than compiling dependencies, and artifacts local to the project aren't cached by rust-cache.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (8a2ef24) 96.82% compared to head (183dde5) 96.82%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1520 +/- ## ======================================= Coverage 96.82% 96.82% ======================================= Files 96 96 Lines 39744 39744 ======================================= Hits 38482 38482 Misses 1262 1262 ```

:umbrella: View full report in Codecov by Sentry.
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[github-actions[bot]]

Benchmark Results for unmodified programs :rocket:

Command	Mean [s]	Min [s]	Max [s]	Relative
base big_factorial	2.849 ± 0.019	2.826	2.891	1.00
head big_factorial	2.914 ± 0.037	2.873	2.976	1.02 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base big_fibonacci	2.450 ± 0.049	2.408	2.576	1.00
head big_fibonacci	2.492 ± 0.014	2.468	2.513	1.02 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base blake2s_integration_benchmark	7.007 ± 0.041	6.943	7.071	1.00
head blake2s_integration_benchmark	7.031 ± 0.042	6.990	7.130	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base compare_arrays_200000	2.557 ± 0.026	2.521	2.609	1.00
head compare_arrays_200000	2.619 ± 0.027	2.571	2.663	1.02 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base dict_integration_benchmark	1.708 ± 0.009	1.701	1.727	1.00
head dict_integration_benchmark	1.745 ± 0.010	1.724	1.762	1.02 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base field_arithmetic_get_square_benchmark	1.205 ± 0.017	1.188	1.236	1.00
head field_arithmetic_get_square_benchmark	1.208 ± 0.014	1.192	1.234	1.00 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base integration_builtins	7.107 ± 0.218	6.979	7.551	1.00
head integration_builtins	7.127 ± 0.205	6.989	7.660	1.00 ± 0.04

Command	Mean [s]	Min [s]	Max [s]	Relative
base keccak_integration_benchmark	7.125 ± 0.020	7.102	7.155	1.00
head keccak_integration_benchmark	7.141 ± 0.027	7.111	7.190	1.00 ± 0.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base linear_search	2.602 ± 0.036	2.564	2.697	1.00
head linear_search	2.643 ± 0.029	2.619	2.718	1.02 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_cmp_and_pow_integration_benchmark	1.719 ± 0.023	1.696	1.764	1.00
head math_cmp_and_pow_integration_benchmark	1.744 ± 0.028	1.718	1.811	1.01 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_integration_benchmark	1.634 ± 0.011	1.621	1.652	1.00
head math_integration_benchmark	1.663 ± 0.011	1.642	1.678	1.02 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base memory_integration_benchmark	1.445 ± 0.013	1.427	1.461	1.00
head memory_integration_benchmark	1.491 ± 0.023	1.464	1.535	1.03 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base operations_with_data_structures_benchmarks	1.578 ± 0.020	1.557	1.629	1.00
head operations_with_data_structures_benchmarks	1.595 ± 0.012	1.579	1.612	1.01 ± 0.02

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
base pedersen	620.8 ± 6.3	615.8	638.0	1.00
head pedersen	624.0 ± 2.2	621.6	628.3	1.01 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base poseidon_integration_benchmark	1.185 ± 0.005	1.179	1.198	1.00
head poseidon_integration_benchmark	1.198 ± 0.005	1.188	1.207	1.01 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base secp_integration_benchmark	2.128 ± 0.016	2.112	2.164	1.00
head secp_integration_benchmark	2.163 ± 0.008	2.155	2.179	1.02 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base set_integration_benchmark	1.186 ± 0.009	1.174	1.208	1.00
head set_integration_benchmark	1.189 ± 0.004	1.184	1.194	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base uint256_integration_benchmark	4.384 ± 0.015	4.356	4.411	1.00
head uint256_integration_benchmark	4.413 ± 0.041	4.372	4.497	1.01 ± 0.01