refactor: make templateImage a property on nativeImage (#18124)

* refactor: make templateImage a property on nativeImage

* Update docs/api/native-image.md

Co-Authored-By: codebytere <codebytere@github.com>

* fix nativeImage prototype deprecation

* update for new property name

* Update docs/api/native-image.md

Co-Authored-By: codebytere <codebytere@github.com>

docs/api/modernization/property-updates.md

@@ -30,8 +30,6 @@ The Electron team is currently undergoing an initiative to convert separate gett
 * `DownloadItem` class
   * `savePath`
   * `paused`
-* `NativeImage`
-  * `templateImage`
 * `Session` module
   * `preloads`
 * `SystemPreferences` module
@@ -58,3 +56,5 @@ The Electron team is currently undergoing an initiative to convert separate gett
   * `applicationMenu`
   * `badgeCount`
   * `name`
+* `NativeImage`
+  * `isMacTemplateImage`

docs/api/native-image.md

@@ -71,7 +71,6 @@ images/
 └── icon@3x.png
 ```
 
-
 ```javascript
 const { Tray } = require('electron')
 let appIcon = new Tray('/Users/somebody/images/icon.png')
@@ -276,10 +275,14 @@ Returns [`Size`](structures/size.md)
 
 Marks the image as a template image.
 
+**[Deprecated Soon](modernization/property-updates.md)**
+
 #### `image.isTemplateImage()`
 
 Returns `Boolean` - Whether the image is a template image.
 
+**[Deprecated Soon](modernization/property-updates.md)**
+
 #### `image.crop(rect)`
 
 * `rect` [Rectangle](structures/rectangle.md) - The area of the image to crop.
@@ -324,3 +327,11 @@ to explicitly add different scale factor representations to an image. This
 can be called on empty images.
 
 [buffer]: https://nodejs.org/api/buffer.html#buffer_class_buffer
+
+## Properties
+
+### `nativeImage.isMacTemplateImage` _macOS_
+
+A `Boolean` property that determines whether the image is considered a [template image](https://developer.apple.com/documentation/appkit/nsimage/1520017-template).
+
+Please note that this property only has an effect on macOS.