fix(resolve): Dont show locking workspace members

[epage]

What does this PR try to resolve?

This is for cargo generate-lockfile and when syncing the lockfile with the manifest. We still show it for cargo update because of cargo update --workspace.

We hacked around this previously by filtering out the num_pkgs==1 case for single packages but this didn't help with workspaces.

How should we test and review this PR?

Additional information

This builds on #14440

[rustbot]

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[epage]

This PR had a refactor on it, merging the cargo generate-lockfile and the lockfile sync (e.g. cargo check) reporting but I realized there was a difference that we might want to preserve: cargo generate-lockfile only shows Adds with relevant information to avoid overwhelming the user.

[weihanglo]

@bors r+

Thanks!

[bors]

:pushpin: Commit d2ec764995885a74f607669c74cbda60787a924e has been approved by weihanglo

It is now in the queue for this repository.

[bors]

:hourglass: Testing commit d2ec764995885a74f607669c74cbda60787a924e with merge ef854d2f66df7bfcd803a6ca1cfa3b619603142c...

[bors]

:sunny: Test successful - checks-actions Approved by: weihanglo Pushing ef854d2f66df7bfcd803a6ca1cfa3b619603142c to master...