Add optional subdirectory for stage in application package #5689

Job	Run time
define-matrix / define-matrix	1s
e2e-fork	0s
e2e-trusted (windows-latest, 3.10) / tests-trusted	6m 1s
e2e-trusted (ubuntu-latest, 3.10) / tests-trusted	3m 45s
	9m 47s

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