feat(select): add itemsPerScrollWindow prop

[JeanMarcMilletScality]

Summary

• Add a new optional itemsPerScrollWindow prop to the Select component (selectv2) to let consumers configure the number of items visible before the option list becomes scrollable.
• Default value is 4, preserving the previous hardcoded behavior — no breaking changes.
• Add a Storybook story (Custom items per scroll window (8)) showcasing the new prop.

Test plan

• Run npm run storybook and open the Components/Inputs/Select section
• Verify the existing More than 4 items story still shows 4 items before scrolling
• Verify the new Custom items per scroll window (8) story shows 8 items before scrolling
• Verify other Select stories (sizes, search bar, modal, etc.) still behave as before

🤖 Generated with Claude Code

[bert-e]

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[bert-e]

Waiting for approval

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[JeanMarcMilletScality]

/approve

[bert-e]

Waiting for approval

The following approvals are needed before I can proceed with the merge:

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Peer approvals must include at least 1 approval from the following list:

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• @hervedombya

• @JeanMarcMilletScality

• @damiengillesscality

• @MonPote

• @ChengYanJin

The following options are set: approve

[ChengYanJin]

LGTM

[bert-e]

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