Instead of using routerCtx just escape the url before routing (#18086)

A consequence of forcibly setting the RoutePath to the escaped url is that the
auto routing to endpoints without terminal slashes fails (Causing #18060.) This
failure raises the possibility that forcibly setting the RoutePath causes other
unexpected behaviors too.

Therefore, instead we should simply pre-escape the URL in the process registering
handler. Then the request URL will be properly escaped for all the following calls.

Fix #17938
Fix #18060
Replace #18062
Replace #17997

Signed-off-by: Andrew Thornton <art27@cantab.net>

modules/context/context.go

@@ -610,9 +610,6 @@ func Contexter() func(next http.Handler) http.Handler {
 			var startTime = time.Now()
 			var link = setting.AppSubURL + strings.TrimSuffix(req.URL.EscapedPath(), "/")
 
-			chiCtx := chi.RouteContext(req.Context())
-			chiCtx.RoutePath = req.URL.EscapedPath()
-
 			var ctx = Context{
 				Resp:    NewResponse(resp),
 				Cache:   mc.GetCache(),