Rewrite command logging to only output log summary at the end

[csvtuda]

Currently, the commands log their progress, success or failures all over the place due to the parallel nature of the graph's execution. This PR aims for a neat log summary, which is only printed once at the very end of the graph's execution and contains (forwarded) errors for all high-level commands (such as upload results, import feature, attach videos).

General idea:

There were 4 errors during plugin execution:

1/4: Cypress results upload

  Blablabla

  - https://example.org

2/4: Feature file import /home/me/cucumber/xyz.feature

  Foo bar

...

[csvtuda]

Future feature.