Switch provisioners to install Go from GitHub releases on Ubuntu (#1025)

* install go

* added validation

* check zero build version

* add versions and for ubuntu2004

* setup for ubuntu

* fix execute command

* fix issue with cat

* fix go.sh

* fix comments

* remove documentation

* fix comment position go.sh ubuntu2004

* fix version

* remove import

* remove variables

* remove fake url

* fix linking to default version

Co-authored-by: Dmitry Shibanov <v-dmshib@microsoft.com>

images/linux/toolset-2004.json

@@ -34,6 +34,16 @@
                 "12.*",
                 "14.*"
             ]
+        },
+        {
+            "name": "go",
+            "url" : "https://raw.githubusercontent.com/actions/go-versions/master/versions-manifest.json",
+            "arch": "x64",
+            "platform" : "linux",
+            "versions": [
+                "1.14.*"
+            ],
+            "default": "1.14.*"
         }
     ]
 }