Add proxy settings and support for migration and webhook (#16704)

* Add proxy settings and support for migration and webhook

* Fix default value

* Add newline for example ini

* Add lfs proxy support

* Fix lint

* Follow @zeripath's review

* Fix git clone

* Fix test

* missgin http requests for proxy

* use empty

Co-authored-by: zeripath <art27@cantab.net>

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: zeripath <art27@cantab.net>

modules/lfs/client_test.go

@@ -13,10 +13,10 @@ import (
 
 func TestNewClient(t *testing.T) {
 	u, _ := url.Parse("file:///test")
-	c := NewClient(u)
+	c := NewClient(u, true)
 	assert.IsType(t, &FilesystemClient{}, c)
 
 	u, _ = url.Parse("https://test.com/lfs")
-	c = NewClient(u)
+	c = NewClient(u, true)
 	assert.IsType(t, &HTTPClient{}, c)
 }