[v24.x backport] watch: get flags from execArgv

[efekrskl]

Backports #61779

The original issue was on 24.x and there seems to be need of a backport

PR-URL: #61779
Reviewed-By: Moshe Atlow moshe@atlow.co.il
Reviewed-By: Yagiz Nizipli yagiz@nizipli.com
Reviewed-By: Colin Ihrig cjihrig@gmail.com
Reviewed-By: Marco Ippolito marcoippolito54@gmail.com

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.11%. Comparing base (065c9b0) to head (36ddaad).
⚠️ Report is 140 commits behind head on v24.x-staging.

Additional details and impacted files

@@               Coverage Diff                @@
##           v24.x-staging   #62108     +/-   ##
================================================
  Coverage          90.10%   90.11%             
================================================
  Files                667      670      +3     
  Lines             199019   200385   +1366     
  Branches           38911    39086    +175     
================================================
+ Hits              179335   180572   +1237     
- Misses             12040    12125     +85     
- Partials            7644     7688     +44     

see 170 files with indirect coverage changes

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