don't block events loop collecting logs

[ndeloof]

What I did
as a new/restarted container is detected by watchContainers, the event handler must return ASAP otherwise the event loop is blocked. So logContainers must run in a goroutine in error group, with other log collectors

Related issue
fixes #10480
https://docker.atlassian.net/browse/ENV-175

(not mandatory) A picture of a cute animal, if possible in relation to what you did

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02 ⚠️

Comparison is base (7b0ed13) 59.90% compared to head (de6d34a) 59.89%.

Additional details and impacted files

@@            Coverage Diff             @@
##               v2   #10493      +/-   ##
==========================================
- Coverage   59.90%   59.89%   -0.02%     
==========================================
  Files         105      105              
  Lines        9056     9058       +2     
==========================================
  Hits         5425     5425              
- Misses       3066     3068       +2     
  Partials      565      565              

Impacted Files	Coverage Δ
pkg/compose/logs.go	39.04% <0.00%> (-0.76%)	⬇️

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[milas]

Tested locally and LGTM

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I feel like we need to refactor some of this in the future -- I cannot actually follow the logic here, we've got multiple levels of errgroup::Go() calls happening across callback boundaries, for example