remove --timeout=0 flag to cleanup function of watch e2e test

[glours]

compose down command need the watch process to be killed to succeed

What I did
Fix the watch e2e tests which fails during the cleanup stage

Related issue
https://github.com/docker/compose/actions/runs/6240098754/job/16939441138

(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: +0.59% 🎉

Comparison is base (421a6b0) 57.38% compared to head (e00fdd9) 57.98%.

❗ Current head e00fdd9 differs from pull request most recent head 61c8be1. Consider uploading reports for the commit 61c8be1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11023      +/-   ##
==========================================
+ Coverage   57.38%   57.98%   +0.59%     
==========================================
  Files         129      129              
  Lines       11227    11121     -106     
==========================================
+ Hits         6443     6448       +5     
+ Misses       4151     4040     -111     
  Partials      633      633              

see 7 files with indirect coverage changes

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