Tree widget: Make model category elements query chunks smaller

[grigasp]

For the test case at hand, there were ~1900 where clauses, so they were all placed into a single huge query. On a local briefcase the query took ~3 minutes to run, on GPB - more than 5 minutes.

Splitting it into chunks of 100 where clauses allows us to execute them in parallel and in GPB case they take ~11 seconds.

[github-actions]

Tree-Widget benchmark

Benchmark suite	Current: ca38eed	Previous: 44c526a	Deviation	Status
categories tree creates initial filtered view for 50k items	2506.22 ms	2531.49 ms	-1.00%	〰️
categories tree creates initial filtered view for 50k items (P95 of main thread blocks)	1665 ms	1669 ms	-0.24%	〰️
categories tree changing category visibility changes visibility for 50k subCategories	9664.38 ms	9514.55 ms	1.57%	〰️
categories tree changing category visibility changes visibility for 50k subCategories (P95 of main thread blocks)	3182 ms	3190 ms	-0.25%	〰️
categories tree changing definition container visibility changes visibility for 50k categories	6801 ms	6326.05 ms	7.51%	〰️
categories tree changing definition container visibility changes visibility for 50k categories (P95 of main thread blocks)	3572 ms	3111 ms	14.82%	🚨
models tree creates initial filtered view for 50k target items	2198.4 ms	2216.81 ms	-0.83%	〰️
models tree creates initial filtered view for 50k target items (P95 of main thread blocks)	82 ms	296 ms	-72.30%	✅
models tree validates categories visibility for imodel with 50k categories	15287.48 ms	15535.35 ms	-1.60%	〰️
models tree validates categories visibility for imodel with 50k categories (P95 of main thread blocks)	4156 ms	4401 ms	-5.57%	〰️
models tree changing model visibility changes visibility for 50k elements	47985.81 ms	45866.25 ms	4.62%	〰️
models tree changing model visibility changes visibility for 50k elements (P95 of main thread blocks)	263 ms	252 ms	4.37%	〰️
models tree changing category visibility changes visibility for 50k elements	47579.59 ms	46551.95 ms	2.21%	〰️
models tree changing category visibility changes visibility for 50k elements (P95 of main thread blocks)	358 ms	246 ms	45.53%	🚨
models tree changing per-model-category override changes visibility for 50k elements	48695.26 ms	46068.5 ms	5.70%	〰️
models tree changing per-model-category override changes visibility for 50k elements (P95 of main thread blocks)	263 ms	244 ms	7.79%	〰️
models tree changing element visibility changes only parent nodes visibility with 50k elements	48470.55 ms	46772.99 ms	3.63%	〰️
models tree changing element visibility changes only parent nodes visibility with 50k elements (P95 of main thread blocks)	459 ms	469 ms	-2.13%	〰️

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