fix(searchbar): forward aria-label and aria-labelledby from host to input

[rudrakshagarwal4200-ai]

Summary

Fixes #31492.

ion-searchbar previously hardcoded aria-label="search text" on its native <input> element and only inherited ['lang', 'dir'] from the host. As a result, custom aria-label or aria-labelledby attributes placed on <ion-searchbar> were never forwarded to the input, causing screen readers to announce "search text" unconditionally regardless of app localization or search context.

Fix

1. In componentWillLoad(), merge ...inheritAriaAttributes(this.el) into this.inheritedAttributes so that aria-label and aria-labelledby are forwarded to the native input, consistent with ion-input and ion-textarea.
2. Keep aria-label="search text" as the default fallback when aria-labelledby is not set on the host, while allowing host aria-label (via spread) or aria-labelledby to take precedence.

[vercel]

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