AppControl: Improve scan performance

[d4rken]

Keep PkgOps related resources alive for the whole operation.

Otherwise we see this when loading app data:

22:03:37.784 SDMSE:Pkg:Ops                        V  querySizeStats(InstallId(pkgId=com.google.android.photopicker, userHandle=UserHandle2(handleId=0)),41217664-9172-527a-b3d5-edabb50a7d69)
22:03:37.785 SDMSE:Pkg:Ops                        V  querySizeStats(InstallId(pkgId=com.google.android.photopicker, userHandle=UserHandle2(handleId=0)),41217664-9172-527a-b3d5-edabb50a7d69) -> SizeStats(appBytes=524288, cacheBytes=0, externalCacheBytes=0, dataBytes=0)
22:03:37.785 SDMSE:Pkg:Ops                        V  isRunning(InstallId(pkgId=com.google.android.inputmethod.latin, userHandle=UserHandle2(handleId=0)), AUTO->ROOT)
22:03:37.785 SDMSE:Pkg:Ops:SR                     V  addChild(): Can't add child, we are not alive: SharedResource(tag=SDMSE:Root:Service:Client:SR, leases=1, children=0)
22:03:37.785 SDMSE:Root:Service:Client:SR         D  close()