Fix adjustsFontSizeToFit clipping when container height shrinks on Android

[imsankalp]

Summary:

When a <Text adjustsFontSizeToFit> component's container height decreases dynamically (e.g. height=60 → height=20), the text is clipped instead of having its font size recalculated.

Root cause: mShouldAdjustSpannableFontSize — the gate that triggers font recalculation in onDraw — is only set by text-content setters (setSpanned, setNumberOfLines, etc.). A pure container resize never sets it. Meanwhile the background Fabric measurement thread mutates the shared cached spannable (tagToSpannableCache) to the larger font size. When the container then shrinks, onDraw skips recalculation and draws the stale large font in the smaller container, causing clipping.

Fix: Override onSizeChanged in ReactTextView to set mShouldAdjustSpannableFontSize = true whenever the view dimensions change and adjustsFontSizeToFit is active. Android automatically schedules a redraw on size change, so the next onDraw recalculates the font with the correct current height.

Changelog:

[ANDROID] [FIXED] - Fix Text with adjustsFontSizeToFit being clipped when container height decreases dynamically

Test Plan:

Tested using the existing RNTester example which already reproduces this bug:

1. Build and run RNTester on Android
2. Navigate to Text → Font Size Adjustment with Dynamic Layout
3. Press Set Height to 60 — text grows to fill the yellow container
4. Press Set Height to 20 — before this fix, text is clipped; after this fix, text shrinks to fit correctly
5. Repeat steps 3–4 rapidly — no clipping at any point

The reproducer is packages/rn-tester/js/examples/Text/TextAdjustsDynamicLayoutExample.js.