* Convert autoupdate version handling to coreos/go-semver
* get the right version in installer endpoint + get rid of x/mod/semver
* depguard x/mod/semver
* Add nolint rules for existing x/mod/semver usages
* Add depguard explanation
* Modulate install script when managed updates v2 are off
* fixup! Modulate install script when managed updates v2 are off
* Address Stephen's feedback