Rebuild SSH installation (#20220)

Closes #ISSUE

This refactors SSH installation to require less shell stuff. We'd like
to
support arbitrary remote hosts, and unfortunately csh/tcsh have quoting
rules
that make it impossible to run multi-line scripts.

The primary changes are:
* The target path now contains the version:
`./zed_server/zed-remote-server-{release_channel}-{version}`
* We do all our processing in a temporary file and `mv` it into place.
* We do fewer calls to `ssh_command` overall. With the previous two
changes we can avoid lock files, and fuser calls. Instead cleanup of old
binaries now happens in `execute_run`.
* We only try to install the remote server when the connection is
established, not on each project open.

This should also put us in a good position if we want to pre-emptively
install new versions when the auto-updater detects an update for the
running version of zed (but that's not wired up yet)

Release Notes:

- Remoting: Fixed remoting when the remote runs `tcsh`
- Remoting: Improved latency of connecting

Cargo.lock

@@ -9562,6 +9562,7 @@ dependencies = [
  "itertools 0.13.0",
  "log",
  "parking_lot",
+ "paths",
  "prost",
  "release_channel",
  "rpc",
@@ -9613,6 +9614,7 @@ dependencies = [
  "settings",
  "shellexpand 2.1.2",
  "smol",
+ "sysinfo",
  "telemetry_events",
  "toml 0.8.19",
  "util",