feat: expose getTmpDir helper from the test utils

[galargh]

• Because this PR includes a bug fix, relevant tests have been included.
• Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• I didn't do anything of this.

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I found it helpful during the draft implementation of #5774. I was also able to apply it to the tests of the console action, which is included in this PR.

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