fix(ci): remove unnecessary Node.js setup from implants job

[hulto]

Node.js is not needed for implant tests. The GitHub Actions runners come
with Node.js pre-installed, so the npx command used in the CTRF conversion
step will work without explicitly setting up Node.js.

Fixes #1432

[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
2744    ±0	2744    ±0	0    ±0	0    ±0	0    ±0	0    ±0	1ms    ±0

Previous Results

Build 🏗️	Result 🧪	Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
#84	✅	2744	2744	0	0	0	0	26.6s

Insights

Average Tests per Run	Total Flaky Tests	Total Failed	Slowest Test (p95)
2744	0	0	43.1s

Slowest Tests

Test 📝	Results 📊	Duration (avg) ⏱️	Duration (p95) ⏱️
eldritch: random::string_impl::tests::test_string_uniform	3	39.3s	43.1s
eldritch: random::string_impl::tests::test_string_uniform	3	39.3s	43.1s
eldritch: random::string_impl::tests::test_string_uniform	3	39.3s	43.1s
eldritch: process::info_impl::tests::test_info_default	3	3.1s	9.0s
eldritch: process::info_impl::tests::test_info_default	3	3.1s	9.0s
eldritch: process::info_impl::tests::test_info_default	3	3.1s	9.0s
eldritch: pivot::port_scan_impl::tests::test_portscan_return_type_starlark_dict_from_interpreter	3	2.7s	8.1s
eldritch: pivot::port_scan_impl::tests::test_portscan_return_type_starlark_dict_from_interpreter	3	2.7s	8.1s
eldritch: pivot::port_scan_impl::tests::test_portscan_return_type_starlark_dict_from_interpreter	3	2.7s	8.1s
eldritch: pivot::ssh_copy_impl::tests::test_pivot_ssh_copy	3	4.0s	8.1s

_{🎉 No failed tests in this run. | 🍂 No flaky tests in this run.}

Github Test Reporter by CTRF 💚

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