fix: use the first language from context to decide Android directionality

[PRESIDENT810]

Summary:

In #53417 I used Locale.getAvailableLocales()[0] to obtain the prioritized locale, which is incorrect according to @mukti107's comment. This returns "an array of all installed locales". However, what we want is the preferred locale specified by users, so it should be context.resources.configuration.locales[0].

I also renamed this from isDevicePreferredLanguageRTL to isApplicationPreferredLanguageRTL so it aligns with iOS's implementation (isDevicePreferredLanguageRTL is not used anywhere in iOS, and isApplicationPreferredLanguageRTL is the one that actually get used) and reflects the usage of this function more accurately (context.resources.configuration.locales[0] would also respect per app's language settings, in addition to system language settings).

Note: since 0.76 React Native's minimum Android support SDK version becomes 24, so using locales which is added in API level 24 should be safe.

Changelog:

Same as in #53417, I used

import { I18nManager } from 'react-native';

I18nManager.allowRTL(true);
I18nManager.swapLeftAndRightInRTL(true);

Then I tried to set system's language to English and Hebrew, then set app's language settings to English and Hebrew. The directionality always conforms to the per app settings. If per app settings not set (use "System Default") then it would conform to the system language.