Triggers a warning when overriding fixtures at the same level #5781

Job	Run time
package	28s
build (windows-py39-unittestextras)	27m 34s
build (windows-py39-pluggy)	6m 41s
build (windows-py39-xdist)	6m 7s
build (windows-py310)	6m 39s
build (windows-py311)	16m 29s
build (windows-py312)	19m 53s
build (windows-py313)	18m 7s
build (ubuntu-py39-lsof-numpy-pexpect)	30m 48s
build (ubuntu-py39-pluggy)	5m 31s
build (ubuntu-py39-freeze)	44s
build (ubuntu-py39-xdist)	5m 13s
build (ubuntu-py310-xdist)	5m 28s
build (ubuntu-py311)	17m 52s
build (ubuntu-py312)	20m 9s
build (ubuntu-py313-pexpect)	24m 23s
build (ubuntu-pypy3-xdist)	7m 52s
build (macos-py39)	6m 37s
build (macos-py310)	6m 14s
build (macos-py312)	3m 56s
build (macos-py313)	3m 52s
build (doctesting)	45s
build (plugins)	51s
check	1s
	4h 2m 14s

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