fix: start process compose

[gabyx]

Proposed Changes

• Fix some proc-compose start/stop ergonomics.

Types of Changes

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that apply

• A bug fix (non-breaking change which fixes an issue). Use MR tag
  bugfix.
• A new feature (non-breaking change which adds functionality). Use MR
  tag feature.
• A breaking change (fix or feature that would cause existing
  functionality to not work as expected). Use MR tag feature.
• A non-productive update (documentation, tooling, etc. if none of the
  other choices apply). Use MR tag chore.

Checklist

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  guidelines.

Further Comments

[codecov]

Codecov Report

Attention: Patch coverage is 83.09859% with 12 lines in your changes missing coverage. Please review.

Project coverage is 60.70%. Comparing base (2b20e08) to head (eb2e6ed).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/cli/cmd/process-compose/exec/exec.go	82.35%	3 Missing and 3 partials ⚠️
pkg/exec/process-compose/compose.go	81.25%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
+ Coverage   60.39%   60.70%   +0.30%     
==========================================
  Files          89       90       +1     
  Lines        4717     4756      +39     
==========================================
+ Hits         2849     2887      +38     
  Misses       1631     1631              
- Partials      237      238       +1     

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