[camera_avfoundation] ios saving path (#10832)

## Description

Changed iOS file storage path from `documentDirectory` to `temporaryDirectory` to ensure consistency with Android where files are stored in cache directory.

## Changes
- iOS now uses `temporaryDirectory` instead of `documentDirectory` for consistency with Android

## Code changes
```swift
// Before:
let documentDirectory = FileManager.default.urls(
      for: .documentDirectory,
      in: .userDomainMask)[0]

// After:
let documentDirectory = FileManager.default.temporaryDirectory
```

## Issues 
https://github.com/flutter/flutter/issues/166933

## Pre-Review Checklist

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[^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.

packages/camera/camera_avfoundation/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.9.23
+
+* Changes the default storage path for camera pictures and videos on iOS from the application's Documents directory to the system's temporaryDirectory.
+
 ## 0.9.22+10
 
 * Handles video and audio interruptions and errors by "pausing" and reporting errors.

packages/camera/camera_avfoundation/example/ios/RunnerTests/PhotoCaptureTests.swift

@@ -201,4 +201,41 @@ final class PhotoCaptureTests: XCTestCase {
 
     waitForExpectations(timeout: 30, handler: nil)
   }
+
+  func testCaptureToFile_mustSavePhotoToCameraPicturesDirectory() {
+    let expectedPath = "/tmp/camera/pictures/"
+    let expectation = self.expectation(
+      description: "Photo must be saved to \(expectedPath) directory.")
+
+    let captureSessionQueue = DispatchQueue(label: "capture_session_queue")
+    captureSessionQueue.setSpecific(
+      key: captureSessionQueueSpecificKey, value: captureSessionQueueSpecificValue)
+    let cam = createCam(with: captureSessionQueue)
+
+    let mockOutput = MockCapturePhotoOutput()
+    mockOutput.capturePhotoWithSettingsStub = { settings, photoDelegate in
+      let delegate = cam.inProgressSavePhotoDelegates[settings.uniqueID]
+      let ioQueue = DispatchQueue(label: "io_queue")
+      ioQueue.async {
+        delegate?.completionHandler(delegate?.filePath, nil)
+      }
+    }
+    cam.capturePhotoOutput = mockOutput
+
+    captureSessionQueue.async {
+      cam.captureToFile { filePath, error in
+        XCTAssertNil(error)
+        XCTAssertNotNil(filePath)
+
+        if let filePath = filePath {
+          XCTAssertTrue(
+            filePath.contains(expectedPath)
+          )
+          expectation.fulfill()
+        }
+      }
+    }
+
+    waitForExpectations(timeout: 30, handler: nil)
+  }
 }

packages/camera/camera_avfoundation/ios/camera_avfoundation/Sources/camera_avfoundation/DefaultCamera.swift

@@ -746,11 +746,9 @@ final class DefaultCamera: NSObject, Camera {
     subfolder: String,
     prefix: String
   ) throws -> String {
-    let documentDirectory = FileManager.default.urls(
-      for: .documentDirectory,
-      in: .userDomainMask)[0]
+    let temporaryDirectory = FileManager.default.temporaryDirectory
 
-    let fileDirectory = documentDirectory.appendingPathComponent("camera").appendingPathComponent(
+    let fileDirectory = temporaryDirectory.appendingPathComponent("camera").appendingPathComponent(
       subfolder)
     let fileName = prefix + UUID().uuidString
     let file = fileDirectory.appendingPathComponent(fileName).appendingPathExtension(ext).path

packages/camera/camera_avfoundation/pubspec.yaml

@@ -2,7 +2,7 @@ name: camera_avfoundation
 description: iOS implementation of the camera plugin.
 repository: https://github.com/flutter/packages/tree/main/packages/camera/camera_avfoundation
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+camera%22
-version: 0.9.22+10
+version: 0.9.23
 
 environment:
   sdk: ^3.9.0