Update example project .gitignores to latest template (#10188)

Under android/ directory, ignore:
GeneratedPluginRegistrant.java

Under ios/ directory, ignore:
GeneratedPluginRegistrant.h
GeneratedPluginRegistrant.m
Pods/

examples/catalog/android/.gitignore

@@ -6,6 +6,7 @@
 .DS_Store
 /build
 /captures
+GeneratedPluginRegistrant.java
 
 /gradle
 /gradlew

examples/catalog/ios/.gitignore

@@ -9,6 +9,8 @@ profile
 
 DerivedData/
 build/
+GeneratedPluginRegistrant.h
+GeneratedPluginRegistrant.m
 
 *.pbxuser
 *.mode1v3
@@ -35,3 +37,5 @@ Icon?
 /Flutter/Flutter.framework
 /Flutter/Generated.xcconfig
 /ServiceDefinitions.json
+
+Pods/

examples/flutter_gallery/android/.gitignore

@@ -6,7 +6,7 @@
 .DS_Store
 /build
 /captures
-PluginRegistry.java
+GeneratedPluginRegistrant.java
 
 /gradle
 /gradlew

examples/flutter_gallery/ios/.gitignore

@@ -10,8 +10,8 @@ profile
 
 DerivedData/
 build/
-PluginRegistry.h
-PluginRegistry.m
+GeneratedPluginRegistrant.h
+GeneratedPluginRegistrant.m
 
 *.pbxuser
 *.mode1v3

examples/flutter_view/android/.gitignore

@@ -6,7 +6,7 @@
 .DS_Store
 /build
 /captures
-PluginRegistry.java
+GeneratedPluginRegistrant.java
 
 /gradle
 /gradlew

examples/flutter_view/ios/.gitignore

@@ -9,8 +9,8 @@ profile
 
 DerivedData/
 build/
-PluginRegistry.h
-PluginRegistry.m
+GeneratedPluginRegistrant.h
+GeneratedPluginRegistrant.m
 
 *.pbxuser
 *.mode1v3

examples/hello_world/android/.gitignore

@@ -6,7 +6,7 @@
 .DS_Store
 /build
 /captures
-PluginRegistry.java
+GeneratedPluginRegistrant.java
 
 /gradle
 /gradlew

examples/hello_world/ios/.gitignore

@@ -9,8 +9,8 @@ profile
 
 DerivedData/
 build/
-PluginRegistry.h
-PluginRegistry.m
+GeneratedPluginRegistrant.h
+GeneratedPluginRegistrant.m
 
 *.pbxuser
 *.mode1v3

examples/layers/android/.gitignore

@@ -6,7 +6,7 @@
 .DS_Store
 /build
 /captures
-PluginRegistry.java
+GeneratedPluginRegistrant.java
 
 /gradle
 /gradlew

examples/layers/ios/.gitignore

@@ -9,8 +9,8 @@ profile
 
 DerivedData/
 build/
-PluginRegistry.h
-PluginRegistry.m
+GeneratedPluginRegistrant.h
+GeneratedPluginRegistrant.m
 
 *.pbxuser
 *.mode1v3

examples/platform_channel/android/.gitignore

@@ -6,7 +6,7 @@
 .DS_Store
 /build
 /captures
-PluginRegistry.java
+GeneratedPluginRegistrant.java
 
 /gradle
 /gradlew

examples/platform_channel/ios/.gitignore

@@ -10,8 +10,8 @@ profile
 
 DerivedData/
 build/
-PluginRegistry.h
-PluginRegistry.m
+GeneratedPluginRegistrant.h
+GeneratedPluginRegistrant.m
 
 *.pbxuser
 *.mode1v3

examples/platform_channel_swift/ios/.gitignore

@@ -10,8 +10,8 @@ profile
 
 DerivedData/
 build/
-PluginRegistry.h
-PluginRegistry.m
+GeneratedPluginRegistrant.h
+GeneratedPluginRegistrant.m
 
 *.pbxuser
 *.mode1v3

examples/stocks/android/.gitignore

@@ -6,7 +6,7 @@
 .DS_Store
 /build
 /captures
-PluginRegistry.java
+GeneratedPluginRegistrant.java
 
 /gradle
 /gradlew

examples/stocks/ios/.gitignore

@@ -10,8 +10,8 @@ profile
 
 DerivedData/
 build/
-PluginRegistry.h
-PluginRegistry.m
+GeneratedPluginRegistrant.h
+GeneratedPluginRegistrant.m
 
 *.pbxuser
 *.mode1v3