fix(android): Prevent text cut-off by clamping lineHeight to font height

[aswinandro]

Summary

On Android 15 & 16, text was being cut off when lineHeight was set smaller than the font’s ascent + descent, due to changes in the platform’s text rendering.
This patch updates CustomLineHeightSpan to always ensure the line box is at least as large as the font’s required height, and sets fm.top/fm.bottom to match the adjusted ascent/descent for all lines.
This prevents descenders and ascenders from being clipped, matching native TextView and web behavior, and does not affect other text features or layouts.
Fixes #56402, #53286, #56402

Changelog:

[Android] [Fixed] - Prevent text cut-off when lineHeight is less than font size by clamping line height to font metrics in CustomLineHeightSpan. This ensures text is never clipped on Android 15 & 16 and matches native TextView/web behavior. Fixes #56402, #53286, 56402

For more details, see:
https://reactnative.dev/contributing/changelogs-in-pull-requests

Test Plan

• Render text with various combinations of fontSize and lineHeight, including cases where lineHeight < fontSize.
• Verify that no text is clipped on Android 15 & 16, especially for characters with descenders (e.g., “g”, “y”, “p”).
• Confirm that text renders correctly on older Android versions and that layouts are unaffected for normal line heights.
• Run existing text rendering tests and visual regression tests to ensure no regressions.

Example test code:

<Text style={{fontSize: 24, lineHeight: 8, borderWidth: 1, borderColor: 'red'}}>
  gyqp
</Text>