Add `descendants: true` to ContentChildren to ease ivy upgrade

[jelbourn]

This issue tracks adding descendants: true for Angular v9 in order to make the update to ivy slightly easier.

[keatkeat87]

hi, just find this.
i try use ivy, look like it can direct get deep child component.
does ivy no need descendants: true ?

[crisbeto]

All of these should be resolved now.

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