Prepare for v0.5.3 dev

* Remove helper script used for checking go mods
* Remove helper script for testing mismatch struct changes

Author: Wilken Rivera

cmd/packer-sdc/internal/test-data/mismatch-structs/test.sh

@@ -16,12 +16,12 @@ import (
 var GitCommit string
 
 // Package version helps plugin creators set and track the sdk version using
-var Version = "0.5.2"
+var Version = "0.5.3"
 
 // A pre-release marker for the version. If this is "" (empty string)
 // then it means that it is a final release. Otherwise, this is a pre-release
 // such as "dev" (in development), "beta", "rc1", etc.
-var VersionPrerelease = ""
+var VersionPrerelease = "dev"
 
 // SDKVersion is used by the plugin set to allow Packer to recognize
 // what version of the sdk the plugin is.