test: do not untar archive into fs when checking file names

[iTrooz]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

In BATS tests, it avoids untar'ing archives into the filesystem when it is not needed. Instead, it uses tar -t to list the archive files instead.

As a bonus, it also fixes the test build with custom build output and output rootfs to tar, which does not check the output of the right command (it seems like it wanted to read the output of ls but it read the output of run_buildah

How to verify it

Run test suite

Which issue(s) this PR fixes:

None

Special notes for your reviewer:

Does this PR introduce a user-facing change?

None

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[packit-as-a-service[bot]]

Ephemeral COPR build failed. @containers/packit-build please check.

[nalind]

Nice catch! The commit log subject line is longer than we generally expect, though, causing it to be wrapped in the commits tab of the pull request web page. LGTM with a tweak to the commit log.

[iTrooz]

Done !