fix(client): Consistent naming for GroupBy args

[SevInf]

Most of other args use non-capitalized name. Follow up to #19606

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #19610 consistent-groupby-name (068ed7d) will degrade performances by 47.07%.

Summary

🔥 0 improvements ❌ 1 regressions ✅ 3 untouched benchmarks

🆕 0 new benchmarks ⁉️ 0 dropped benchmarks

:warning: Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	consistent-groupby-name	Change
❌	typescript compilation ~50 Models	99.4 ms	187.8 ms	-47.07%

[Jolg42]

@SevInf Is this ready for a review? It looks like some tests are failing

[SevInf]

@Jolg42 not yet, will fix it in the coming days