fix(@angular/cli): correctly split array options

[d-koppenhagen]

This PR will fix #16320

[splincode]

@alan-agius4 is it still active?

[alan-agius4]

@splincode no.

@d-koppenhagen, thanks for your contribution.

We've been evaluating an alternative parsers for a number of months and currently we'd like to avoid changing the semantics of how the parser threats values as this can eventually lead to breaking changes depending on which parser we choose to go with.

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