[versioned] If user adds new version, remove previous versions of canonical

[mikeland73]

Summary

If there's an existing package with same canonical, remove it. If there's more than one do nothing.

How was it tested?

Need to test this a bit more to ensure no weird side-effects of doing a remove inside an add

On this repo did:

cat devbox.json
devbox add [email protected]
cat devbox.json
devbox add [email protected]
cat devbox.json

[loreto]

LGTM

[savil]

You could add a testscript unit-test similar to the test plan.

May need to add a custom function (https://github.com/jetpack-io/devbox/blob/8b4a1050ef730cedc400c62a6bf3f71adac9bbb6/testscripts/testrunner/testrunner.go#L70) called json.list.contains and use it as json.list.contains devbox.json packages [email protected] and json.list.contains.not devbox.json packages [email protected]

[savil]

thanks for adding the testscript!