Auto merge of #110972 - ehuss:remove-awscli, r=pietroalbini

Remove aws cli install.

All runner images have the AWS CLI 2 installed, so there isn't a really strong reason to install our own version anymore.

The version we were installing was 1.27.122. The runner images currently have 2.11.x (the exact version varies by image).

I do not have the means to really test if the new version has any issues. I looked at all the `aws` commands, and none of them seem to be doing anything unusual. The page at https://docs.aws.amazon.com/cli/latest/userguide/cliv2-migration-changes.html contains a list of all the breaking changes, and I didn't see anything that looked important.

Author: bors