Use "is-loading" to avoid duplicate form submit for code comment (#28143) #28147
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Backport #28143 by @wxiaoguang
Compare by ignoring spaces: https://github.com/go-gitea/gitea/pull/28143/files?diff=split&w=1
When the form is going to be submitted, add the "is-loading" class to show an indicator and avoid user UI events.
When the request finishes (success / error), remove the "is-loading" class to make user can interact the UI.