Fix agent not logging collector logs to stdout by default in containers

[karensantana]

Proposed changes

When running in a container the agent collector logs are being written to disk instead of stdout. This change fixes this behavior so if a path is not specified in the config, stdout is used by default in containers.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

[codecov]

Codecov Report

❌ Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.87%. Comparing base (25415cb) to head (ffd2988).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/config/config.go	42.85%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1757   +/-   ##
=======================================
  Coverage   84.86%   84.87%           
=======================================
  Files         105      105           
  Lines       13632    13634    +2     
=======================================
+ Hits        11569    11572    +3     
+ Misses       1540     1537    -3     
- Partials      523      525    +2     

Files with missing lines	Coverage Δ
internal/config/defaults.go	100.00% <ø> (ø)
internal/config/config.go	87.86% <42.85%> (+0.02%)	⬆️

... and 2 files with indirect coverage changes

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[craigell]

Think we can append a integration test for this in an existing suite since we use containers for testing.

[karensantana]

Think we can append a integration test for this in an existing suite since we use containers for testing.

Perfect, I'll add that. 👍