Use LFS object size instead of blob size when viewing a LFS file (#35679)

shows the main LFS filesize instead of the pointer filesize when viewing
a file

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Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

tests/integration/lfs_view_test.go

@@ -72,6 +72,8 @@ func TestLFSRender(t *testing.T) {
 
 		fileInfo := doc.Find("div.file-info-entry").First().Text()
 		assert.Contains(t, fileInfo, "LFS")
+		fileSize := doc.Find("div.file-info-entry > .file-info-size").Text()
+		assert.Equal(t, "2.0 KiB", fileSize)
 
 		// find new file view container
 		fileViewContainer := doc.Find("[data-global-init=initRepoFileView]")