Forbid HTML injection using jQuery (#29843)

See
https://github.com/wikimedia/eslint-plugin-no-jquery/blob/master/docs/rules/no-append-html.md

Tested the following components and they work as before:
- notification table
- issue author dropdown
- comment edit box attachments div

Signed-off-by: Yarden Shoham <git@yardenshoham.com>
Co-authored-by: Giteabot <teabot@gitea.io>

.eslintrc.yaml

@@ -400,7 +400,7 @@ rules:
   no-jquery/no-and-self: [2]
   no-jquery/no-animate-toggle: [2]
   no-jquery/no-animate: [2]
-  no-jquery/no-append-html: [0]
+  no-jquery/no-append-html: [2]
   no-jquery/no-attr: [0]
   no-jquery/no-bind: [2]
   no-jquery/no-box-model: [2]