TF-2426 Fix build ci failed with build_runner error

scripts/prebuild.sh

@@ -12,28 +12,29 @@ flutter pub get
 # flutter pub get && pod install
 
 cd ../model
-flutter pub get && dart run build_runner build --delete-conflicting-outputs
+flutter clean && flutter pub get && dart run build_runner build --delete-conflicting-outputs
 
 cd ../contact
-flutter pub get && dart run build_runner build --delete-conflicting-outputs
+flutter clean && flutter pub get && dart run build_runner build --delete-conflicting-outputs
 
 cd ../forward
-flutter pub get && dart run build_runner build --delete-conflicting-outputs
+flutter clean && flutter pub get && dart run build_runner build --delete-conflicting-outputs
 
 cd ../rule_filter
-flutter pub get && dart run build_runner build --delete-conflicting-outputs
+flutter clean && flutter pub get && dart run build_runner build --delete-conflicting-outputs
 
 cd ../fcm
-flutter pub get && dart run build_runner build --delete-conflicting-outputs
+flutter clean && flutter pub get && dart run build_runner build --delete-conflicting-outputs
 
 cd ../email_recovery
-flutter pub get && dart run build_runner build --delete-conflicting-outputs
+flutter clean && flutter pub get && dart run build_runner build --delete-conflicting-outputs
 
 cd ../server_settings
-flutter pub get && dart run build_runner build --delete-conflicting-outputs
+flutter clean && flutter pub get && dart run build_runner build --delete-conflicting-outputs
 
 cd ..
-flutter pub get \
+flutter clean \
+    && flutter pub get \
     && dart run build_runner build --delete-conflicting-outputs \
     && dart run intl_generator:extract_to_arb --output-dir=./lib/l10n lib/main/localizations/app_localizations.dart \
     && dart run intl_generator:generate_from_arb --output-dir=lib/l10n --no-use-deferred-loading lib/main/localizations/app_localizations.dart lib/l10n/intl*.arb