refactor(js_semantic): reduce semantic data size and make some cleanup

[Conaclos]

Summary

This PR reduces the size of the semantic data models.
Also, I made some cleanup.

Test Plan

CI must pass.

[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	48299	48299	0
Passed	47102	47102	0
Failed	1197	1197	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	6546	6546	0
Passed	2201	2201	0
Failed	4345	4345	0
Panics	0	0	0
Coverage	33.62%	33.62%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	669	669	0
Passed	597	597	0
Failed	72	72	0
Panics	0	0	0
Coverage	89.24%	89.24%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	18264	18264	0
Passed	14000	14000	0
Failed	4264	4264	0
Panics	0	0	0
Coverage	76.65%	76.65%	0.00%

[codspeed-hq]

CodSpeed Performance Report

Merging #3417 will degrade performances by 6.17%

_{Comparing conaclos/js_semantic-reduce-data-size (48d8387) with main (8eb0e8a)}

Summary

❌ 1 regressions
✅ 107 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	conaclos/js_semantic-reduce-data-size	Change
❌	dojo_11880045762646467684.js[cached]	7.9 ms	8.4 ms	-6.17%