kool start error message improv + verbose output improvement

[fabriciojs]

Issue	#279
🧰 Improvement	Yes
📖 Documentation	No
⚠️ Break Change	No

Description

• kool start - improved error message when no docker-compose.yml or else designated docker compose config file not found in the current working dir;
• improve the output of actual commands when using --verbose

Notes

• Other suggestions on the ticket don't seem to be worth the trade-off at this point - because handling more errors would mean wrapping the output file pointers to some sort of buffer to be able to check it later, but that would cause for losing TTY capacity when using interactive - something we don't want.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (852c3f0) 73.21% compared to head (881ff30) 73.23%.

❗ Current head 881ff30 differs from pull request most recent head 89195e6. Consider uploading reports for the commit 89195e6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #483      +/-   ##
==========================================
+ Coverage   73.21%   73.23%   +0.01%     
==========================================
  Files          75       75              
  Lines        2972     2974       +2     
==========================================
+ Hits         2176     2178       +2     
+ Misses        727      725       -2     
- Partials       69       71       +2     

Files	Coverage Δ
commands/start.go	92.30% <0.00%> (-2.43%)	⬇️
core/shell/shell.go	80.00% <50.00%> (+1.48%)	⬆️

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