Update ProcessHelper to use env variable for timeout

[JoshuaBehrens]

Change timeout property to use environment variable with a default value.
This is a change to adapt to

deployment-helper/src/Command/RunCommand.php

Line 49 in 2a60ed3

timeout: (float) (is_numeric($timeout) ? $timeout : EnvironmentHelper::getVariable('SHOPWARE_DEPLOYMENT_TIMEOUT', '300')),

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.45%. Comparing base (2a60ed3) to head (e6f28e6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #62   +/-   ##
=======================================
  Coverage   96.45%   96.45%           
=======================================
  Files          35       35           
  Lines         733      733           
=======================================
  Hits          707      707           
  Misses         26       26           

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