refactor(astro): migrate dev tests to typescript #16408

Performance Gate Passed

✅ 18 untouched benchmarks

_{Comparing ocavue-forks:ocavue-ts-test-astro-dev (c153d3c) with main (a002540)¹}

No successful run was found on main (32b361d) during the generation of this report, so a002540 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩