fix: add missing experimental_ types in manual .d.ts (#54797)

Summary:
- `experimental_backgroundSize`
- `experimental_backgroundPosition`
- `experimental_backgroundRepeat`

types are missing in the manually written .d.ts file but are available in `react-native-strict-api`

## Changelog:

[GENERAL] [FIXED] - Added missing `experimental_backgroundSize`, `experimental_backgroundPosition`, `experimental_backgroundRepeat` to manually written types.

Pull Request resolved: #54797

Test Plan: CI

Reviewed By: cortinico

Differential Revision: D88483858

Pulled By: javache

fbshipit-source-id: 4fa42aab42a7be529c292d1b807ee46417756bca

Author: tjzel

packages/react-native/Libraries/StyleSheet/StyleSheetTypes.d.ts

@@ -367,7 +367,7 @@ export type BlendMode =
   | 'color'
   | 'luminosity';
 
-export type GradientValue = {
+export type LinearGradientValue = {
   type: 'linear-gradient';
   // Angle or direction enums
   direction?: string | undefined;
@@ -377,6 +377,89 @@ export type GradientValue = {
   }>;
 };
 
+export type GradientValue = LinearGradientValue;
+
+type RadialExtent =
+  | 'closest-corner'
+  | 'closest-side'
+  | 'farthest-corner'
+  | 'farthest-side';
+export type RadialGradientPosition =
+  | {
+      top: number | string;
+      left: number | string;
+    }
+  | {
+      top: number | string;
+      right: number | string;
+    }
+  | {
+      bottom: number | string;
+      left: number | string;
+    }
+  | {
+      bottom: number | string;
+      right: number | string;
+    };
+
+export type RadialGradientShape = 'circle' | 'ellipse';
+export type RadialGradientSize =
+  | RadialExtent
+  | {
+      x: string | number;
+      y: string | number;
+    };
+
+type RadialGradientValue = {
+  type: 'radial-gradient';
+  shape: RadialGradientShape;
+  size: RadialGradientSize;
+  position: RadialGradientPosition;
+  colorStops: ReadonlyArray<{
+    color: ColorValue | null;
+    positions?: ReadonlyArray<string> | undefined;
+  }>;
+};
+
+export type BackgroundImageValue = LinearGradientValue | RadialGradientValue;
+
+export type BackgroundSizeValue =
+  | {
+      x: string | number;
+      y: string | number;
+    }
+  | 'cover'
+  | 'contain';
+
+export type BackgroundRepeatKeyword =
+  | 'repeat'
+  | 'space'
+  | 'round'
+  | 'no-repeat';
+
+export type BackgroundPositionValue =
+  | {
+      top: number | string;
+      left: number | string;
+    }
+  | {
+      top: number | string;
+      right: number | string;
+    }
+  | {
+      bottom: number | string;
+      left: number | string;
+    }
+  | {
+      bottom: number | string;
+      right: number | string;
+    };
+
+export type BackgroundRepeatValue = {
+  x: BackgroundRepeatKeyword;
+  y: BackgroundRepeatKeyword;
+};
+
 /**
  * @see https://reactnative.dev/docs/view#style
  */
@@ -437,7 +520,19 @@ export interface ViewStyle extends FlexStyle, ShadowStyleIOS, TransformsStyle {
 
   mixBlendMode?: BlendMode | undefined;
   experimental_backgroundImage?:
-    | ReadonlyArray<GradientValue>
+    | ReadonlyArray<BackgroundImageValue>
+    | string
+    | undefined;
+  experimental_backgroundSize?:
+    | ReadonlyArray<BackgroundSizeValue>
+    | string
+    | undefined;
+  experimental_backgroundPosition?:
+    | ReadonlyArray<BackgroundPositionValue>
+    | string
+    | undefined;
+  experimental_backgroundRepeat?:
+    | ReadonlyArray<BackgroundRepeatValue>
     | string
     | undefined;
 }