Reduce lock scope in `FSDirectory.DeleteFile`, #1428 #1093

Job	Run time
Test (windows-latest, net8.0, x64, Release)	3m 13s
Test (windows-latest, net48, x64, Release)	2m 46s
Test (windows-latest, net10.0, x64, Release)	2m 27s
Test (ubuntu-latest, net10.0, x64, Release)	1m 36s
Test (ubuntu-latest, net8.0, x64, Release)	2m 20s
Test (windows-latest, net472, x64, Release)	3m 48s
	16m 10s

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