fix(perf): Apply base grid scroll performance optimizations.

[MayaKirova]

Closes #16709

• throttle scroll
• move diff check out of ngDoCheck
• use transform instead of top to limit layout reflow.
• remove HostListener that reads scrollTop to prevent unnecessary layout reflow.
• remove zone runs where possible.
• use afterNextRender when updating position of container in DOM.

[dkamburov]

The changes look good and functionality works as expected.

I did notice one minor behavior difference while testing:

• Issue: When holding Tab to navigate between cells during editing, the navigation feels slightly slower than before
• Possible cause: This might be related to the throttle timing or the transform scroll implementation

This is very minor, but wanted to flag it in case it's worth investigating. Otherwise, I'm verifying the PR.

[dkamburov]

Performance Optimization Summary

Detailed Optimizations

Optimization	Technique	Before (Baseline)	After (Optimized)	Expected Delta
Array allocation	push() → pre-allocated new Array(n)	O(n) resizes with copying	O(1) direct assignment	~20-40% faster for sizesCache building
DOM element lookup	Repeated .map() → cached getter	Re-computed every scroll	Single traversal, cached	~15-25% fewer CPU cycles per scroll
Change detection	ngDoCheck → property setter	Called every CD cycle	Called only on data change	~30-50% fewer CD calls
CSS positioning	style.top → transform: translateY()	Triggers layout reflow	GPU-accelerated, no reflow	~50-70% faster paint
Scroll event handling	Raw events → 40ms throttle	~60+ events/sec processed	~25 events/sec processed	~60% fewer scroll handlers
Scroll helper listener	@HostListener removed	Duplicate event processing	Single event path	~10-15% less overhead

Aggregate Impact Estimate (100k rows, 100 scroll operations)

Metric	Before (est.)	After (est.)	Delta
Long Tasks Count	~80-120	~30-50	-50% to -60%
Avg Long Task Duration	~80-120ms	~55-75ms	-30% to -40%
Total Blocking Time	~8-12 sec	~3-5 sec	-50% to -60%
Frames per second	~15-25 fps	~40-55 fps	+100% to +150%

[dkamburov]

The changes look good and functionality works as expected.

I did notice one minor behavior difference while testing:

• Issue: When holding Tab to navigate between cells during editing, the navigation feels slightly slower than before
• Possible cause: This might be related to the throttle timing or the transform scroll implementation

This is very minor, but wanted to flag it in case it's worth investigating. Otherwise, I'm verifying the PR.

Please ignore my previous message. Everything seems to be working as expected, likely due to temporary high resource usage.