Follow-up from "Move init_tools script into gitlab rails"

MR: Pending

Description

The following discussion from !191251 (merged) should be addressed:

• @cwoolley-gitlab started a discussion: (+1 comment)

  thought (non-blocking): There's some more elegant ways to handle the sub-process execution, such as Open3.popen3 (https://docs.ruby-lang.org/en/master/Open3.html#method-c-popen3).

  Could we make a quick TODO and follow-up issue to consider converting this to Open3.popen3?

Acceptance criteria

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Implementation plan

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