basebackup_to_shell: Add TAP test.

Robert Haas <rhaas@postgresql.org>

Commit: 027fa0fd72619a56d9d8877eedcb514331b63fa4
Author: Robert Haas <rhaas@postgresql.org>
Date: 2022-03-30T19:47:02Z
Releases: 15.0
basebackup_to_shell: Add TAP test.

Per gripe from Andres Freund. Thanks to Andres Freund, Thomas
Munro, and Andrew Dunstan for advice on how to make this test
work even on Windows.

Discussion: https://postgr.es/m/CA+Tgmoat+zbzzZQJ7poXyUwiqxQxTaUid=auB4FejZ15VvDh4Q@mail.gmail.com

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