CI: suppress lintian warning on usage of skip-not-installable

Paride Legovinirequested to merge
paride/autopkgtest:lintian-suppress-ignore-skip-not-installable into master

We run the Salsa CI pipeline so SALSA_CI_LINTIAN_FAIL_WARNING enabled, so the tag causes the pipeline to fail. Suppress the tag for now.

We currently use skip-not-installable to allow the LXD tests (d/t/lxd) to be skipped on Debian, where lxd is not readily available, without extra test runtime logic.

I want to drop that usage skip-not-installable, but doing so requires some discussion on how move away from the current logic. For now, this change will allow CI to pass again.

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