Don't use experimental decorators in extensions

Seeing if we can compile our extensions using TS native which doesn't support these. The usage is so low that I think we can just remove them

extensions/git/tsconfig.json

@@ -2,7 +2,6 @@
 	"extends": "../tsconfig.base.json",
 	"compilerOptions": {
 		"outDir": "./out",
-		"experimentalDecorators": true,
 		"typeRoots": [
 			"./node_modules/@types"
 		]