Enrich the summary with a note of amount of resources changed on the report experiment

[jorgehaufe]

Currently --summary-per-unit summarizes based on module, success and time. The report could be enriched to highlight whether modules had changes or not. Something like:

$ terragrunt run --all plan --summary-per-unit

Omitted for brevity...

❯❯ Run Summary 3 units 10m
──────────────────────────────
Succeeded (3)
long-running-unit 10m No changes
medium-running-unit 12s 1 addition, 2 modified
short-running-unit 5ms 2 deletion, 1 replace