`AppSideNav` - overlay scrolling bug fix (HDS-3914) #12566

Job	Run time
Get files changed and conditionally skip CI	13s
Tests	6m 55s
ember-lts-3.28	3m 56s
ember-lts-4.12	3m 33s
ember-beta	3m 29s
embroider-safe	1m 27s
	19m 33s

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