zshippable in minor versions cause upgrade to fail

[adduarte]

Bug description
adduarte
Member

During dev testing of cluster upgrade functionality, some of the package versions could have a non-numberic postfix, like "-zshippable".

The clusterbootstrap webhook incorrectly decides a version string like "0.12.1+vmware.2-tkg.2-zshippable" is a newer version than "0.12.1+vmware.2-tkg.3" becuase any non-number minor version (2-zshippable) is newer than a number version ("3")
thus the webhook sees "0.12.1+vmware.2-tkg.2-zshippable" is a newer version than "0.12.1+vmware.2-tkg.3", causing upgrade to fail.
Affected product area (please put an X in all that apply)

• ( ) APIs
• (x ) Addons
• ( ) CLI
• ( ) Docs
• ( ) IAM
• ( ) Installation
• ( ) Plugin
• ( ) Security
• ( ) Test and Release
• ( ) User Experience
• ( ) Developer Experience

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