refactor(core)!: Remove not used cap write_multi_align_size

[Xuanwo]

Which issue does this PR close?

None

Rationale for this change

write_multi_align_size is designed solely for gcs, but it's now never been used.

What changes are included in this PR?

Remove write_multi_align_size from capability.

Are there any user-facing changes?

[codspeed-hq]

CodSpeed Performance Report

Merging #5322 will degrade performances by 18.88%

_{Comparing remove-range-writer (d179ca9) with main (4dc0f15)}

Summary

❌ 8 regressions
✅ 65 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	remove-range-writer	Change
❌	buffer 256 KiB * 32 chunk	154.4 ns	183.6 ns	-15.89%
❌	buffer 256 KiB * 4 chunk	125.3 ns	154.4 ns	-18.88%
❌	buffer 4.00 MiB * 32 chunk	125.3 ns	154.4 ns	-18.88%
❌	buffer 4.00 MiB * 4 chunk	125.3 ns	154.4 ns	-18.88%
❌	256 KiB * 1000k truncate	245.8 ns	275 ns	-10.61%
❌	256 KiB * 100k truncate	245.8 ns	275 ns	-10.61%
❌	256 KiB * 10k truncate	245.8 ns	275 ns	-10.61%
❌	256 KiB * 1k truncate	245.8 ns	275 ns	-10.61%

[Xuanwo]

Thank you @PsiACE for the review!