[Bug 1918920] [NEW] Harden test for no new acquires after transaction abort

[Julian Andres Klode]

Public bug reported:

[Impact]
test-pdiff-usage is somewhat flaky, especially on Debian, this makes it less flaky. No end user impact as it's a test-only change.

[Test plan]
Running autopkgtest, which runs our extensive integration test suite which includes the changed test.

[Where problems could occur]
No end user regression potential on its own, but might slightly change regression potential for future pdiff changes:

Test approach is slightly different now. It still catches that updates
fail correctly, but tests more concretely that a transaction was aborted
rather than that no worker received work (which was not guaranteed, the
work could be scheduled before it was aborted).

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: Fix Committed

** Affects: apt (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Affects: apt (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Affects: apt (Ubuntu Groovy)
     Importance: Undecided
         Status: New

** Also affects: apt (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: apt (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: apt (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1918920

Title:
  Harden test for no new acquires after transaction abort

Status in apt package in Ubuntu:
  Fix Committed
Status in apt source package in Bionic:
  New
Status in apt source package in Focal:
  New
Status in apt source package in Groovy:
  New

Bug description:
  [Impact]
  test-pdiff-usage is somewhat flaky, especially on Debian, this makes it less flaky. No end user impact as it's a test-only change.

  [Test plan]
  Running autopkgtest, which runs our extensive integration test suite which includes the changed test.

  [Where problems could occur]
  No end user regression potential on its own, but might slightly change regression potential for future pdiff changes:

  Test approach is slightly different now. It still catches that updates
  fail correctly, but tests more concretely that a transaction was
  aborted rather than that no worker received work (which was not
  guaranteed, the work could be scheduled before it was aborted).

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