[Native] Add RCTSelectableText as a recognized Text component (facebook#35780)

## Summary

Add "RCTSelectableText" to the list of component names recognized as
being inside a text element, alongside "RCTText".

React Native's new text stack, tries to optimize and allows
differentiating between a custom TextView, with lower level control,
that can reuse the work performed during Fabric/Yoga layout, and a
native TextView, used for fidelity. On Android at least, the only place
we've needed native TextView for fidelity/native UX has been support for
`selectable` text, which has many unique UI interactions.

## How did you test this change?

When I patch this in, alongside
facebook/react-native#55552, we no longer see
warnings when we render text inside of RCTSelectableText component.

---------

Co-authored-by: Eli White <github@eli-white.com>

Author: NickGerleman

packages/react-native-renderer/src/ReactFiberConfigFabric.js

@@ -278,6 +278,7 @@ export function getChildHostContext(
     const isInAParentText =
       type === 'AndroidTextInput' || // Android
       type === 'RCTMultilineTextInputView' || // iOS
+      type === 'RCTSelectableText' ||
       type === 'RCTSinglelineTextInputView' || // iOS
       type === 'RCTText' ||
       type === 'RCTVirtualText';

packages/react-native-renderer/src/ReactFiberConfigNative.js

@@ -275,6 +275,7 @@ export function getChildHostContext(
   const isInAParentText =
     type === 'AndroidTextInput' || // Android
     type === 'RCTMultilineTextInputView' || // iOS
+    type === 'RCTSelectableText' ||
     type === 'RCTSinglelineTextInputView' || // iOS
     type === 'RCTText' ||
     type === 'RCTVirtualText';