fix(@ngtools/webpack): recursive look up unused files

[filipesilva]

Fix #15626

[alan-agius4]

LGTM

[dgp1130]

Looks like one of these commits was not included in the patch branch (8f4cee3) and is causing a merge conflict when attempting to merge #16164.

I'm assuming this was simply an oversight and not intentional. Can someone please confirm and I'll include it in the patch branch now.

[filipesilva]

@dgp1130 that commit should have been in the patch branch, yes.

[dgp1130]

Thanks @filipesilva, merged 8f4cee3 to 9.0.x patch branch. This PR should be all good.

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