test: use insta for JS parser

[ematipico]

Summary

This PR ports the JS tests to use insta and the same logic used in other parsers and crates across the codebase. I copied all the files we had in test_data and moved them in a new folder called js_test_suite, which name is inline with the tests parser infras.

All the files that were tagged with a // SCRIPT were renamed to have a .cjs extension. All *.options.json files now use a valid biome.json file. With this, I discovered that the grit_metavariables weren't implemented for the JS parser (cc @arendjr). This is now fixed, and the file metavar.ts works as expected.

The biome_js_parser crate also had some testing utilities we aren't supposed to use anymore because they now live inside biome_test_utils. I removed them and used biome_test_utils instead.

I removed some outdated README.md files inside the codegen files. That information is already present in the biome_parser/CONTRIBUTING.md file.

I didn't remove all the comments in the source .rs files, that was too much. I think they can stay there for now, and we can remove them later.

Test Plan

The current CI should pass

[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	48420	48420	0
Passed	47220	47220	0
Failed	1200	1200	0
Panics	0	0	0
Coverage	97.52%	97.52%	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	18507	18507	0
Passed	14167	14167	0
Failed	4340	4340	0
Panics	0	0	0
Coverage	76.55%	76.55%	0.00%

[codspeed-hq]

CodSpeed Performance Report

Merging #4386 will not alter performance

_{Comparing tests/js-parser-snapshots (113d93b) with main (28a2a6c)}

Summary

✅ 101 untouched benchmarks