chore: remove JS parser test generation codegen

[Conaclos]

Summary

We recently replaced the inline tests with proper insta tests in #4386.
The codegen that generates test data from the inline tests was not removed.
This PR removes this codegen.

Test Plan

CI must pass.

[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	48537	48537	0
Passed	47345	47345	0
Failed	1192	1192	0
Panics	0	0	0
Coverage	97.54%	97.54%	0.00%

jsx/babel

Test result	main count	This PR count	Difference
Total	40	40	0
Passed	37	37	0
Failed	3	3	0
Panics	0	0	0
Coverage	92.50%	92.50%	0.00%

symbols/microsoft

Test result	main count	This PR count	Difference
Total	6580	6580	0
Passed	2205	2205	0
Failed	4375	4375	0
Panics	0	0	0
Coverage	33.51%	33.51%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	680	680	0
Passed	607	607	0
Failed	73	73	0
Panics	0	0	0
Coverage	89.26%	89.26%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	18568	18568	0
Passed	14228	14228	0
Failed	4340	4340	0
Panics	0	0	0
Coverage	76.63%	76.63%	0.00%

[codspeed-hq]

CodSpeed Performance Report

Merging #4443 will not alter performance

_{Comparing conaclos/remove-parser-test-generation-script (ae46989) with main (9089e7d)}

Summary

✅ 99 untouched benchmarks