Auth: Don't clear auth token cookie when lookup token fails (grafana#…

…32999)

If LookupToken fails we don't clear the auth token cookie.

Ref grafana#15316

pkg/services/contexthandler/contexthandler.go

@@ -259,12 +259,6 @@ func (h *ContextHandler) initContextWithToken(ctx *models.ReqContext, orgID int6
 	token, err := h.AuthTokenService.LookupToken(ctx.Req.Context(), rawToken)
 	if err != nil {
 		ctx.Logger.Error("Failed to look up user based on cookie", "error", err)
-
-		var revokedErr *models.TokenRevokedError
-		if !errors.As(err, &revokedErr) || !ctx.IsApiRequest() {
-			cookies.WriteSessionCookie(ctx, h.Cfg, "", -1)
-		}
-
 		ctx.Data["lookupTokenErr"] = err
 		return false
 	}