Check for warnings in isotovideo test

[kalikiana]

And remove the misleading and unused output handling.

See: https://progress.opensuse.org/issues/120786

Note: This would have shown a clear error message when failing tests in #2206. It doesn't address the problem of CI behaving differently.

[codecov]

Codecov Report

Merging #2211 (7accf74) into master (dee0e60) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2211   +/-   ##
=======================================
  Coverage   92.27%   92.27%           
=======================================
  Files         157      157           
  Lines       15218    15218           
=======================================
  Hits        14042    14042           
  Misses       1176     1176           

Impacted Files	Coverage Δ
t/14-isotovideo.t	99.58% <100.00%> (ø)
t/data/tests/bar/baz.pm
t/data/tests/foo.pm	100.00% <0.00%> (ø)

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[perlpunk]

Note: This would have failed and shown a clear error message on #2206.

Really? I put it on top of #2206 and pushed it to my fork, and CI passed.

I still don't know why I get a failure locally and CI passes, but this PR doesn't address this :)

[perlpunk]

See my comment. I don't see how this helps

[kalikiana]

See my comment. I don't see how this helps

It helps by revealing the information we used to understand the problem. As for CI I opened #2213.

[perlpunk]

The description still says that #2206 would have failed with this.

[kalikiana]

The description still says that #2206 would have failed with this.

I re-phrased it.

[perlpunk]

I don't know why removing $output as a return value from isotovideo() would be necessary but ok...