Merge branch 'selftests-drv-net-add-ability-to-schedule-cleanup-with-defer'

Jakub Kicinski says:

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selftests: drv-net: add ability to schedule cleanup with defer()

Introduce a defer / cleanup mechanism for driver selftests.
More detailed info in the second patch.
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Link: https://patch.msgid.link/20240627185502.3069139-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>