Remove backported os.Expand() implementation

Fábio Matavellirequested to merge
fabiomatavelli/gitlab-runner:remove-backported-expand-implementation into master

What does this MR do?

Remove backported os.Expand() implementation originally made in !1677 (merged).

Why was this MR needed?

This is related to #4915 (closed)

Are there points in the code the reviewer needs to double check?

Maybe tests

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Added tests for this feature/bug
  • In case of conflicts with master - branch was rebased

What are the relevant issue numbers?

Closes #4915 (closed)

Edited by Fábio Matavelli

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