[skip ci] Hide generated files from diff via .gitattributes (#11802)

Author: iluuu1994

.gitattributes

@@ -19,11 +19,11 @@
 *.php diff=php
 *.[ch] diff=cpp
 
-# Collapse generated files within a pull request.
-**/*_arginfo.h linguist-generated
-/Zend/zend_vm_execute.h linguist-generated
-/Zend/zend_vm_handlers.h linguist-generated
-/Zend/zend_vm_opcodes.[ch] linguist-generated
+# Collapse generated files within git and pull request diff.
+**/*_arginfo.h linguist-generated -diff
+/Zend/zend_vm_execute.h linguist-generated -diff
+/Zend/zend_vm_handlers.h linguist-generated -diff
+/Zend/zend_vm_opcodes.[ch] linguist-generated -diff
 
 # The OSS fuzz files are bunary
 /ext/date/tests/ossfuzz*.txt binary