fix: update system test to use monorepo where appropriate

[leahecole]

Fixes the system test to pull from the monorepo for video intelligence and kms, and to pull from the speech repo for speech. It's a little gross because we now have some monorepo tests and some not, but it's nothing some good ol' ternary operators can't handle!

Remove videointelligence because it's flaky and the smoke test was removed recently anyways, so it would have been doing nothing once the latest release came out

this is my first typescript PR (back in 2019 I was still doing regular node when I was contributing code) so be ruthless and teach me the ways! 😁

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Fixes googleapis/google-cloud-node-core#273

[leahecole]

I'm unable to replicate this timeout failure locally or in the videointelligence repo but I'm requesting a rebuild to see if it's a flake

[alexander-fenster]

Looks good!

[leahecole]

Update, I am able to make this failure occur locally when I checkout the v4.1.1 version of video intelligence. Fwiw, I noticed that this PR gets rid of the smoke tests used here googleapis/google-cloud-node@6c68bd8

Not sure if we want to keep using video intelligence given that?