fix(ui5-flexible-column-layout): expose separator accessible name via aria-label

[rodriguescarson]

Fixes #13775

Problem

In FlexibleColumnLayoutTemplate.tsx, the start and end resize separators (role="separator") set their accessible name via the title attribute:

<div role={this.accStartSeparatorRole} title={this.accStartSeparatorText} ... >

title is not read by VoiceOver at default verbosity, so the separators are effectively unnamed for those users. As noted in the issue, the name should be exposed at least via aria-label, and a customer rejected title-based naming.

Fix

Expose the accessible name via aria-label instead of title on both separators. aria-label is the correct accessible-name mechanism for the separator role and is read across screen readers (VoiceOver, JAWS, NVDA). The name strings (accStartSeparatorText / accEndSeparatorText) are unchanged, so it's an attribute swap.

Also updated packages/fiori/cypress/specs/FCL.cy.tsx ("tests separator acc attrs") to assert aria-label instead of title on .ui5-fcl-separator-start / .ui5-fcl-separator-end.

Notes

Minimal, verifiable-by-inspection change. I updated the one spec that asserted title; happy to keep title as an additional tooltip too if the team prefers exposing both, but per the issue the accessible name should come from aria-label.

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