Refactor template & test related code (#32938)

Move some legacy code from "base" package to proper packages.

modules/templates/util_format_test.go

@@ -0,0 +1,18 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package templates
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCountFmt(t *testing.T) {
+	assert.Equal(t, "125", countFmt(125))
+	assert.Equal(t, "1.3k", countFmt(int64(1317)))
+	assert.Equal(t, "21.3M", countFmt(21317675))
+	assert.Equal(t, "45.7G", countFmt(45721317675))
+	assert.Equal(t, "", countFmt("test"))
+}