Fix user settings sidebar showing disabled features on some pages (#36958)

Move UserDisabledFeatures context data into a shared SettingsCtxData
middleware for the /user/settings route group, so it is set consistently
on all pages (including Notifications, Actions, etc.) instead of only on
the handlers that remembered to set it individually.

Fixes #36954

routers/web/user/setting/settings.go

@@ -9,9 +9,17 @@ import (
 
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/json"
+	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/services/context"
 )
 
+func SettingsCtxData(ctx *context.Context) {
+	ctx.Data["PageIsUserSettings"] = true
+	ctx.Data["EnablePackages"] = setting.Packages.Enabled
+	ctx.Data["EnableNotifyMail"] = setting.Service.EnableNotifyMail
+	ctx.Data["UserDisabledFeatures"] = user_model.DisabledFeaturesWithLoginType(ctx.Doer)
+}
+
 func UpdatePreferences(ctx *context.Context) {
 	type preferencesForm struct {
 		CodeViewShowFileTree bool `json:"codeViewShowFileTree"`