build: remove dependency on font-awesome

[alan-agius4]

This dependency is only used to valid that node packages are resolved correctly.

With this change we mock the structure of font-awesome to avoid having to install it.

[ngbot[bot]]

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[dgp1130]

This had a merge conflict in patch, so I retargeted it to minor and made https://github.com/angular/angular-cli/pull/23681/ with a patch-specific PR.

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