[Tree-widget]: Add learning snippet for getSubTreePaths

[JonasDov]

Added learning snippet for getSubTreePaths usage.

[github-actions]

Tree-Widget benchmark

Benchmark suite	Current: 86fd4de	Previous: 583279d	Deviation	Status
categories tree creates initial filtered view for 50k items	2403.72 ms	2444.81 ms	-1.68%	〰️
categories tree creates initial filtered view for 50k items (P95 of main thread blocks)	1658 ms	1686 ms	-1.66%	〰️
categories tree changing category visibility changes visibility for 50k subCategories	9964.72 ms	10356.38 ms	-3.78%	〰️
categories tree changing category visibility changes visibility for 50k subCategories (P95 of main thread blocks)	3639 ms	3998 ms	-8.98%	〰️
categories tree changing definition container visibility changes visibility for 50k categories	7303.34 ms	6596.02 ms	10.72%	🚨
categories tree changing definition container visibility changes visibility for 50k categories (P95 of main thread blocks)	4663 ms	3390 ms	37.55%	🚨
models tree creates initial filtered view for 50k target items	2283.59 ms	2308.47 ms	-1.08%	〰️
models tree creates initial filtered view for 50k target items (P95 of main thread blocks)	350 ms	332 ms	5.42%	〰️
models tree validates categories visibility for imodel with 50k categories	14587.82 ms	14602.88 ms	-0.10%	〰️
models tree validates categories visibility for imodel with 50k categories (P95 of main thread blocks)	4151 ms	4088 ms	1.54%	〰️
models tree changing model visibility changes visibility for 50k elements	45639.18 ms	49329.04 ms	-7.48%	〰️
models tree changing model visibility changes visibility for 50k elements (P95 of main thread blocks)	344 ms	369 ms	-6.78%	〰️
models tree changing category visibility changes visibility for 50k elements	48984.88 ms	48541.95 ms	0.91%	〰️
models tree changing category visibility changes visibility for 50k elements (P95 of main thread blocks)	273 ms	246 ms	10.98%	〰️
models tree changing per-model-category override changes visibility for 50k elements	46993.62 ms	48429.92 ms	-2.97%	〰️
models tree changing per-model-category override changes visibility for 50k elements (P95 of main thread blocks)	273 ms	237 ms	15.19%	〰️
models tree changing element visibility changes only parent nodes visibility with 50k elements	48576.22 ms	49451.71 ms	-1.77%	〰️
models tree changing element visibility changes only parent nodes visibility with 50k elements (P95 of main thread blocks)	475 ms	500 ms	-5%	〰️

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