[iOS] Fix duplicated testID

[m-bert]

Description

This PR fixes duplicated testID prop on iOS. Same accessibilityLabel was assigned to both, wrapper and button, therefore frameworks like Detox failed due to multiple elements with the same ID.

Fixes #3698

Test plan

Tested on branch with e2e tests.

[Copilot]

Pull request overview

Fixes an iOS/Fabric issue where testID was applied to both the wrapper component view and the underlying button, causing e2e frameworks (e.g. Detox) to see multiple matches for a single by.id(...) query.

Changes:

• Clears accessibilityIdentifier from the wrapper view after Fabric’s super updateProps applies testID, so only the actual _buttonView keeps the identifier.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.