Update integration test .gitignores to latest template (#10191)

Under android/ directory, ignore:
GeneratedPluginRegistrant.java

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

dev/benchmarks/complex_layout/android/.gitignore

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

dev/benchmarks/complex_layout/ios/.gitignore

@@ -10,6 +10,8 @@ profile
 
 DerivedData/
 build/
+GeneratedPluginRegistrant.h
+GeneratedPluginRegistrant.m
 
 *.pbxuser
 *.mode1v3
@@ -36,3 +38,5 @@ Icon?
 /Flutter/Flutter.framework
 /Flutter/Generated.xcconfig
 /ServiceDefinitions.json
+
+Pods/

dev/benchmarks/microbenchmarks/android/.gitignore

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

dev/benchmarks/microbenchmarks/ios/.gitignore

@@ -10,6 +10,8 @@ profile
 
 DerivedData/
 build/
+GeneratedPluginRegistrant.h
+GeneratedPluginRegistrant.m
 
 *.pbxuser
 *.mode1v3
@@ -36,3 +38,5 @@ Icon?
 /Flutter/Flutter.framework
 /Flutter/Generated.xcconfig
 /ServiceDefinitions.json
+
+Pods/

dev/integration_tests/channels/android/.gitignore

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

dev/integration_tests/channels/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/

dev/integration_tests/ui/android/.gitignore

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

dev/integration_tests/ui/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/

dev/manual_tests/android/.gitignore

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

dev/manual_tests/ios/.gitignore

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