Update integration tests regexes. (#144847)

Some tests are assuming the flutter sdk code is being checked out to flutter and checking the code to a different repository makes them fail.

Bug: flutter/flutter#144487

Author: godofredoc

packages/flutter_tools/test/integration.shard/flutter_build_apk_verbose_test.dart

@@ -49,7 +49,7 @@ void main() {
         '-v',
       ], workingDirectory: exampleAppDir.path);
       expect(
-          result.stdout, contains(RegExp(r'executing:\s+\S+gen_snapshot\s+')));
+          result.stdout, contains(RegExp(r'executing:\s+.+gen_snapshot\s+')));
     },
   );
 }

packages/flutter_tools/test/integration.shard/overall_experience_test.dart

@@ -251,7 +251,7 @@ void main() {
         'A RenderFlex overflowed by 69200 pixels on the right.',
         '',
         'The relevant error-causing widget was:',
-        matches(RegExp(r'^  Row .+flutter/dev/integration_tests/ui/lib/overflow\.dart:32:18$')),
+        matches(RegExp(r'^  Row.+/dev/integration_tests/ui/lib/overflow\.dart:32:18$')),
         '',
         'To inspect this widget in Flutter DevTools, visit:',
         startsWith('http'),