fix(cli): asset existence check is slow for many assets

[rix0rrr]

When an application has many assets (think ~100) the existence check which seeks to scrub already existing assets from the work graph is starting to take a significant amount of time. Do those checks in parallel.

Also in this PR:

• Improve the printing of the work graph a little to make it slightly less unreadable if the graph gets large.
• Print the graphviz representation of the work graph to the trace log if the graph gets stuck, for debugging purposes.
• In the work graph builder, only add dependencies on stacks. Previously, it used to add dependencies on assets as if they were stacks (those were later on removed, but we didn't need to add them in the first place).

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[gitpod-io]

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: bd19035
• Result: SUCCEEDED
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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).