Merge tag 'pull-request-2025-09-09' of https://gitlab.com/thuth/qemu into staging

* Silence warnings from the undefined-behaviour sanitizer
* Many small improvements to various functional tests
* Remove remainders from storing avocado artifacts in the Gitlab CI
* Keep more meson log files as artifacts in the Gitlab CI instead
* Re-enable -fzero-call-used-regs on OpenBSD

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# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [full]
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* tag 'pull-request-2025-09-09' of https://gitlab.com/thuth/qemu: (23 commits)
  tests/functional: purge scratch dir on test startup
  tests/functional: avoid tearDown failure when QEMU dies
  tests/functional: avoid duplicate messages on failures
  tests/functional: fix infinite loop on console EOF
  tests/functional: add vm param to cmd.py helpers
  tests/functional: return output from cmd.py helpers
  gitlab: prevent duplicated meson log artifacts in test jobs
  gitlab: include all junit XML files from meson
  gitlab: always include entire of meson-logs directory
  gitlab: replace avocado results files with meson results files
  tests/functional/arm: Update test ASPEED SDK v09.07 for AST2700 vbootrom
  tests/functional/arm: Update test ASPEED SDK v09.07 for AST2600
  tests/functional/arm: Update test ASPEED SDK v09.07 for AST2500
  tests/functional/arm: Update test ASPEED SDK v03.02 for AST1030
  tests/functional: handle URLError when fetching assets
  tests/functional: fix formatting of exception args
  tests/functional: enable force refresh of cached assets
  tests/functional/m68k: Avoid ResourceWarning in the nextcube test
  ui/vnc: Fix crash when specifying [vnc] without id in the config file
  system/physmem: Silence warning from ubsan
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>