This commit adds the possibility to click the labels in the message
"User added/removed the X label", which will lead to the issues page,
filtered by the clicked label.
This pull requests aims to fix#19768
_I've tried to follow the contribution guidelines as carefully as
possible, but in case I made a mistake: Please correct me._
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Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
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