Upgrade cppwinrt and csharp Calculator samples (#1018)

## Description
Upgrade cppwinrt and csharp calculator samples to 0.78.

### Why
Part of the 0.78 release.

### Screenshots
Calculator cppwinrt:

![image](https://github.com/user-attachments/assets/9fb0089a-dc30-47f6-894c-e6354fcf9454)

Calculator csharp:

![image](https://github.com/user-attachments/assets/efaa662b-bc1d-418a-9975-81064ec42feb)


###### Microsoft Reviewers: [Open in
CodeFlow](https://microsoft.github.io/open-pr/?codeflow=https://github.com/microsoft/react-native-windows-samples/pull/1018)

Author: Yajur-Grover

samples/Calculator/cppwinrt/.gitignore

@@ -33,6 +33,7 @@ local.properties
 .cxx/
 *.keystore
 !debug.keystore
+.kotlin/
 
 # node.js
 #

samples/Calculator/cppwinrt/README.md

@@ -4,7 +4,7 @@ See [../README.md](../README.md) for details of this sample.
 
 See [../csharp/](../csharp/) for a C# version of this sample.
 
-It currently targets React Native Windows 0.76.
+It currently targets React Native Windows 0.78.
 
 ### Setup
 See [../README.md#Setup](../README.md#Setup).

samples/Calculator/cppwinrt/android/app/build.gradle

@@ -63,14 +63,14 @@ def enableProguardInReleaseBuilds = false
  * The preferred build flavor of JavaScriptCore (JSC)
  *
  * For example, to use the international variant, you can use:
- * `def jscFlavor = 'org.webkit:android-jsc-intl:+'`
+ * `def jscFlavor = io.github.react-native-community:jsc-android-intl:2026004.+`
  *
  * The international variant includes ICU i18n library and necessary data
  * allowing to use e.g. `Date.toLocaleString` and `String.localeCompare` that
  * give correct results when using with locales other than en-US. Note that
  * this variant is about 6MiB larger per architecture than default.
  */
-def jscFlavor = 'org.webkit:android-jsc:+'
+def jscFlavor = 'io.github.react-native-community:jsc-android:2026004.+'
 
 android {
     ndkVersion rootProject.ext.ndkVersion

samples/Calculator/cppwinrt/android/build.gradle

@@ -3,7 +3,7 @@ buildscript {
         buildToolsVersion = "35.0.0"
         minSdkVersion = 24
         compileSdkVersion = 35
-        targetSdkVersion = 34
+        targetSdkVersion = 35
         ndkVersion = "27.1.12297006"
         kotlinVersion = "2.0.21"
     }

samples/Calculator/cppwinrt/android/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.10.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12-all.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

samples/Calculator/cppwinrt/android/gradlew

@@ -11,9 +11,9 @@
     "windows": "npx @react-native-community/cli run-windows"
   },
   "dependencies": {
-    "react": "18.3.1",
-    "react-native": "0.77.0",
-    "react-native-windows": "^0.77.0"
+    "react": "19.0.0",
+    "react-native": "0.78.1",
+    "react-native-windows": "^0.78.1"
   },
   "devDependencies": {
     "@babel/core": "^7.25.2",
@@ -22,19 +22,19 @@
     "@react-native-community/cli": "15.0.1",
     "@react-native-community/cli-platform-android": "15.0.1",
     "@react-native-community/cli-platform-ios": "15.0.1",
-    "@react-native/babel-preset": "0.77.0",
-    "@react-native/eslint-config": "0.77.0",
-    "@react-native/metro-config": "0.77.0",
-    "@react-native/typescript-config": "0.77.0",
+    "@react-native/babel-preset": "0.78.1",
+    "@react-native/eslint-config": "0.78.1",
+    "@react-native/metro-config": "0.78.1",
+    "@react-native/typescript-config": "0.78.1",
     "@types/jest": "^29.5.13",
-    "@types/react": "^18.2.6",
-    "@types/react-test-renderer": "^18.0.0",
+    "@types/react": "^19.0.0",
+    "@types/react-test-renderer": "^19.0.0",
     "eslint": "^8.19.0",
     "jest": "^29.6.3",
     "prettier": "2.8.8",
-    "react-test-renderer": "18.3.1",
+    "react-test-renderer": "19.0.0",
     "typescript": "5.0.4",
-    "metro-config": "^0.81.0"
+    "metro-config": "^0.81.4"
   },
   "engines": {
     "node": ">=18"

samples/Calculator/cppwinrt/package-lock.json

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- This project was created with react-native-windows 0.76.2 -->
+<!-- This project was created with react-native-windows 0.78.1 -->
 <Project ToolsVersion="Current" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="$(SolutionDir)\ExperimentalFeatures.props" Condition="Exists('$(SolutionDir)\ExperimentalFeatures.props')" />
   <PropertyGroup Label="Globals">