Add VSCode setting to ignore whitespace in git blame (#53534)

Doesn't use --ignore-revs-file because it was added in a more recent Git version (2.23.0) than Ubuntu 18.04 ships (2.17.1)

.vscode/settings.json

@@ -9,5 +9,8 @@
 			"viewType": "imagePreview.previewEditor"
 		}
 	],
-	"files.eol": "\n"
+
+	"files.eol": "\n",
+
+	"gitlens.advanced.blame.customArguments": ["-w"]
 }