Backport clean scripts from main branch

(cherry picked from commit 4834ab1eab)

clean-release.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+rm -rf releases tmp web

clean.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+rm -rf godot*.tar.gz mono-glue out releases tmp web
+git status