Reduce nesting

[saskliutas]

Reduced unnecessary nesting by removing intermediate itwin folder: packages/itwin/some-package -> packages/some-package

[Copilot]

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[saskliutas]

@aruniverse This is repo wide change let me know if you are ok with it and we can by pass approvals to avoid distracting all code owners.

[github-actions]

Tree-Widget benchmark

Benchmark suite	Current: c0ea49d	Previous: 1cf1f1d	Deviation	Status
models tree creates initial filtered view for 50k target items	815 ms	893 ms	-8.73%	〰️
models tree creates initial filtered view for 50k target items (P95 of main thread blocks)	106 ms	124 ms	-14.52%	〰️
models tree validates categories visibility for imodel with 50k categories	8268 ms	8443 ms	-2.07%	〰️
models tree validates categories visibility for imodel with 50k categories (P95 of main thread blocks)	74 ms	87 ms	-14.94%	〰️
models tree changing model visibility changes visibility for 50k elements	2546 ms	3297 ms	-22.78%	✅
models tree changing model visibility changes visibility for 50k elements (P95 of main thread blocks)	101 ms	0 ms	10100%	🚨
models tree changing category visibility changes visibility for 50k elements	2107 ms	3156 ms	-33.24%	✅
models tree changing category visibility changes visibility for 50k elements (P95 of main thread blocks)	0 ms	0 ms	0%	🟰
models tree changing per-model-category override changes visibility for 50k elements	2210 ms	2997 ms	-26.26%	✅
models tree changing per-model-category override changes visibility for 50k elements (P95 of main thread blocks)	0 ms	0 ms	0%	🟰
models tree changing element visibility changes only parent nodes visibility with 50k elements	3502 ms	5031 ms	-30.39%	✅
models tree changing element visibility changes only parent nodes visibility with 50k elements (P95 of main thread blocks)	67 ms	96 ms	-30.21%	〰️
categories tree creates initial filtered view for 50k items	1479 ms	1622 ms	-8.82%	〰️
categories tree creates initial filtered view for 50k items (P95 of main thread blocks)	234 ms	484 ms	-51.65%	✅
categories tree changing definition container visibility changes visibility for 50k subCategories	2949 ms	2798 ms	5.40%	〰️
categories tree changing definition container visibility changes visibility for 50k subCategories (P95 of main thread blocks)	53 ms	54 ms	-1.85%	〰️
categories tree changing definition container visibility changes visibility for 50k categories	6573 ms	5723 ms	14.85%	🚨
categories tree changing definition container visibility changes visibility for 50k categories (P95 of main thread blocks)	215 ms	122 ms	76.23%	🚨

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