Add user status filter to admin user management page (#16770)

It makes Admin's life easier to filter users by various status.

* introduce window.config.PageData to pass template data to javascript module and small refactor

move legacy window.ActivityTopAuthors to window.config.PageData.ActivityTopAuthors
make HTML structure more IDE-friendly in footer.tmpl and head.tmpl
remove incorrect <style class="list-search-style"></style> in head.tmpl
use log.Error instead of log.Critical in admin user search

* use LEFT JOIN instead of SubQuery when admin filters users by 2fa. revert non-en locale.

* use OptionalBool instead of status map

* refactor SearchUserOptions.toConds to SearchUserOptions.toSearchQueryBase

* add unit test for user search

* only allow admin to use filters to search users

modules/context/context.go

@@ -48,10 +48,11 @@ type Render interface {
 
 // Context represents context of a request.
 type Context struct {
-	Resp   ResponseWriter
-	Req    *http.Request
-	Data   map[string]interface{}
-	Render Render
+	Resp     ResponseWriter
+	Req      *http.Request
+	Data     map[string]interface{} // data used by MVC templates
+	PageData map[string]interface{} // data used by JavaScript modules in one page
+	Render   Render
 	translation.Locale
 	Cache   cache.Cache
 	csrf    CSRF
@@ -646,6 +647,9 @@ func Contexter() func(next http.Handler) http.Handler {
 					"Link":          link,
 				},
 			}
+			// PageData is passed by reference, and it will be rendered to `window.config.PageData` in `head.tmpl` for JavaScript modules
+			ctx.PageData = map[string]interface{}{}
+			ctx.Data["PageData"] = ctx.PageData
 
 			ctx.Req = WithContext(req, &ctx)
 			ctx.csrf = Csrfer(csrfOpts, &ctx)