Added info about code handling for Windows runner

Julian Paul Dasmarinasrequested to merge
docs/exit-code-handling-windows into main

What does this MR do?

Fixes #1153 (closed)

Added information to the FAQ with regards to exit code handling for Windows runner.

Moving docs to a new location?

  • Make sure the old link is not removed and has its contents replaced with a link to the new location.
  • Make sure internal links pointing to the document in question are not broken.
  • Search and replace any links referring to old docs in GitLab Runner's source code

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