Backport #28873 by wxiaoguang
Gitea treat JS errors seriously, so sometimes the JS errors caused by
3rdparty code (eg: browser extensions) would also be reported on Gitea
UI: TypeError: WeakMap key undefined (caused by extension DarkReader's
bug) #28861
To avoid fill the user's screen with a lot of error messages, this PR
merges the same error messages into one.
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
