x/build: add linux-arm-aws to the set of trybots

[cagedmantis]

As per our goals of including a trybot for any platform that can cause a release blocking issue (#29239), we will add linux-arm-aws to the set of trybots. It should be able to complete the trybot run limit of 10 minutes. These new trybots will help solve various open issues linked to host resources (#35628, #40872).

This change will require renaming the linux-arm builders to linux-arm-scaleway because there is a need to map the AWS instances to some slowbot aliases.

@golang/release @cherrymui

[cherrymui]

SGTM, thanks.

As of now the old linux-arm builders don't seem to be provide much. Maybe we can consider just removing them.

[cagedmantis]

I would like to keep the Scaleway builders around until we no longer support Go 1.15. We used Scaleway builders to package Go 1.15 and I would like to continue using the same configuration to package the rest of Go 1.15. I can discuss it with the team today to ensure that this is a good idea.

[cherrymui]

Okay, thanks for the information.

[gopherbot]

Change https://golang.org/cl/303230 mentions this issue: dashboard: add linux-arm-aws to trybots