feat: add release reactions and a GitHub-like reaction bar (#38415)

Adds emoji reactions to releases and moves the reaction picker of
issues, comments and releases into a GitHub-like reaction bar.

- Releases omit 👎 or 😕
- Drafts and tags can't be reacted to
- Moved menu to tippy
- Added keyboard navigation

Fixes: https://github.com/go-gitea/gitea/issues/34268
Fixes: https://github.com/go-gitea/gitea/issues/16676
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/context/upload/upload.go

@@ -104,6 +104,7 @@ type uploadOptions struct {
 
 // AddUploadContext renders template values for dropzone
 func AddUploadContext(ctx *context.Context, uploadType string) {
+	ctx.Data["IsAttachmentEnabled"] = setting.Attachment.Enabled
 	switch uploadType {
 	case "release":
 		ctx.Data["UploadOptions"] = uploadOptions{