roachtest: fix javascript installation commands

[rafiss]

Once again, the "proper" way to install nodejs has changed. This new way uses the latest instructions from https://github.com/nodesource/distributions

fixes #113588
fixes #113578
fixes #113569
fixes #113560
fixes #113586
fixes #113606
fixes #113607
fixes #113606
fixes #113604
fixes #113603
fixes #113614

Release note: None

[cockroach-teamcity]

This change is 

[annrpom]

Once again, the "proper" way to install nodejs has changed

🥲 - does "setup_18.x" imply that we should also set NODE_MAJOR=18?

[rafiss]

I added that to the URL explicitly, so instead of

NODE_MAJOR=20
echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_$NODE_MAJOR.x nodistro main" | sudo tee /etc/apt/sources.list.d/nodesource.list

we use

echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_18.x nodistro main" | sudo tee /etc/apt/sources.list.d/nodesource.list

[annrpom]

ah - i can't read! lgtm

[rafiss]

tftr!

bors r+

[craig]

Build succeeded:

• Bazel Essential CI (Cockroach)