.gitignore prepackaged_plugins and report.xml (#13765)

.gitignore

@@ -26,6 +26,7 @@ imports/imports.go
 .prebuild
 .npminstall
 .yarninstall
+/prepackaged_plugins
 
 # Compiled Object files, Static and Dynamic libs (Shared Objects)
 *.o
@@ -91,6 +92,7 @@ ecover.out
 cprofile.out
 *.test
 webapp/coverage
+/report.xml
 
 .agignore
 .ctags