allow overriding the cloud operation timeout with a CLI arg or environment variable

[zackelan]

CLI version: EdgeDB CLI 3.5.0-dev (7292db83cf64b9eeb7ef10a83ef5262141fc466c, master branch as of 2023-08-18)

current behavior

the maximum wait time for a cloud operation (instance create/upgrade/destroy) is hardcoded at 5 minutes:

https://github.com/edgedb/edgedb-cli/blob/master/src/cloud/ops.rs#L15

this is a reasonable default for users, but in testing I'm doing against the cloud I'd like to wait longer, to see how long the operation takes if there were no timeout (or a much longer timeout)

desired behavior

I'd like to be able to override the timeout using a CLI option or environment variable (either one would be fine, whichever is easier to implement)

workaround

I'm currently overriding this by changing the hardcoded default to one hour and building the CLI locally. this works, but it's a hack specific to my machine and won't work as we try to move these tests off my dev box and into a testing microservice (see https://github.com/edgedb/nebula/discussions/497)