Alert about all charmlib updates available (not just ones matching the spec) on pack

[lengau]

What needs to get done

Right now pack only alerts of an update if it matches the charm-libs key, but it should alert on any available update.

Likewise, fetch-libs should alert the user about updates available that don't match the specification in charmcraft.yaml

Why it needs to get done

In an unrelated conversation @jnsgruk mentioned that this should be done and it looks like I misunderstood "if there are newer versions of the library available in the store, or the libraries do not match the constraints specified, the user should be notified as part of the packing process, but it should only be a warning/info notice, and the pack process should carry on using the in-tree libraries." to be about fetch-libs being able to update and not about every case of updates.

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3622.

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