Fix upgrade-juju --dry-run and upgrades from custom binaries #8102
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Description of change
There were several small issues with upgrade-juju. The main one occurred when running a custom build (with a build number > 0). --dry-run would report n upgrade available, but then running the upgrade would not use the available version and instead upload a new custom build.
Other fixes include some message tweaks and not actually building a local jujud when using dry run.
QA steps
Run up a custom build, eg 2.3-beta2.1
Use juju upgrade-juju with no args and ensure it upgrades to 2.3-beta3
(it would fail before)
Documentation changes
None, just fixing bad behaviour.
Bug reference
https://bugs.launchpad.net/juju/+bug/1732879