Adds `hostname-suffix` flag to `coder ssh` command for use in SSH Config ProxyCommands.
Also enforces that Coder server doesn't start the suffix with a dot.
part of: #16828
This adds a flag matching `--ssh-host-prefix` from `coder config-ssh` to
`coder ssh`. By trimming a custom prefix from the argument, we can set
up wildcard-based `Host` entries in SSH config for the IDE plugins (and
eventually `coder config-ssh`).
We also replace `--` in the argument with `/`, so ownership can be
specified in wildcard-based SSH hosts like `<owner>--<workspace>`.
Replaces #16087.
Part of https://github.com/coder/coder/issues/14986.
Related to https://github.com/coder/coder/pull/16078 and
https://github.com/coder/coder/pull/16080.
This is the first in a series of PRs to enable `coder ssh` to replace
`coder vscodessh`.
This change adds `--network-info-dir` and `--network-info-interval`
flags to the `ssh` subcommand. These were formerly only available with
the `vscodessh` subcommand.
Subsequent PRs will add a `--ssh-host-prefix` flag to the ssh
subcommand, and adjust the log file naming to contain the parent PID.
