ci/ga: Remove .pdf association before running tests on windows #5687

Job	Run time
build (3.7, x64, ubuntu)	56m 42s
build (3.7, x64, windows)	4m 49s
build (3.11, x64, ubuntu)	1h 21m 33s
build (3.11, x64, macos)	36m 31s
build (3.11, x64, windows)	3m 38s
build (3.12, x64, ubuntu)	1h 24m 19s
build (3.12, x64, macos)	32m 13s
build (3.12, x64, windows)	3m 32s
build (3.9, macos, --cov=psyneulink)	1h 0m 10s
build (3.9, ubuntu, --forked -m "not llvm")	36m 12s
build (3.8, x86, windows)	4m 22s
build (3.10, ubuntu, --fp-precision=fp32)	1h 24m 22s
build (3.10, macos, -m benchmark --benchmark-enable --benchmark-only --benchmark-min-rounds=2 --b...	31m 24s
build (3.7, x64, ubuntu, min)	59m 42s
build (3.8, macos)	32m 13s
	10h 11m 42s

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