Merge branch 'tools-ynl-tests-adjust-makefile-to-mimic-ksft'

Jakub Kicinski says:

====================
tools: ynl: tests: adjust Makefile to mimic ksft

Make a few minor adjustments to tools/net/ynl/tests/Makefile
to align its behavior more with how real kselftests behave.
This series allows running the YNL tests in NIPA with little
extra integration effort.

If anyone already integrated these tests into their CI minor
adjustments to the integration may be needed (due to patch 2).
====================

Link: https://patch.msgid.link/20260303163504.2084981-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>