fix(@schematics/schematics): await expect result in full schematic test

[alan-agius4]

(cherry picked from commit 56c5bce)

[clydin]

@googlebot I consent.

[googlebot]

CLAs look good, thanks!

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[ngbot]

I see that you just added the PR action: merge label, but the following checks are still failing:
     status "ci/circleci: e2e-cli-ve" is failing

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If you can't get the PR to a green state due to flakes or broken master, please try rebasing to master and/or restarting the CI job. If that fails and you believe that the issue is not due to your change, please contact the caretaker and ask for help.

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