Resolve autopkgtest failures caused by dpkg >= 1.22.12

Streamlining the rules around the Section field and especially what
happens if its isn't present are a good idea in general, but for testing
proposes we want a package without a section ~ something dpkg and co do
not want us to have for good reasons (outside of tests).

While a real nosection package would interact with more of our code, for
this test we don't really need a real one and so we can adopt to the new
reality of encountering such packages only if they are already
installed instead of trying to build a sectionless package by hand.

The other failure is a simple and trivial string change around the
formatting of the version number in dpkg error message about file
overrides, which we can resolve by just not looking at the version to
sidestep dealing with the formatting difference.

References: https://lists.debian.org/debian-dpkg/2024/12/msg00010.html
Closes: #1092090

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