[backport] Plugin installer support for .tgz file types #6147
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These file extensions should be interchangeable, so there's no reason
for our plugin installer not to support them. We actually did support
.tgz file types up until we added .zip support.
The first commit is a minor refactor to DRY up the code a bit.
The second commit adds .tgz support.
To test this, confirm that the plugin installer still handles .zip, and .tar.gz,
but also .tgz.
Backports PR #6083 for issue #6074