Add basic PyEnv and pixi support for python environments (#37156)

cc https://github.com/zed-industries/zed/issues/29807

Release Notes:

- Fixed terminals and tasks not respecting python pyenv and pixi
environments

crates/remote/src/remote_client.rs

@@ -757,7 +757,6 @@ impl RemoteClient {
         args: &[String],
         env: &HashMap<String, String>,
         working_dir: Option<String>,
-        activation_script: Option<String>,
         port_forward: Option<(u16, String, u16)>,
     ) -> Result<CommandTemplate> {
         let Some(connection) = self
@@ -767,14 +766,7 @@ impl RemoteClient {
         else {
             return Err(anyhow!("no connection"));
         };
-        connection.build_command(
-            program,
-            args,
-            env,
-            working_dir,
-            activation_script,
-            port_forward,
-        )
+        connection.build_command(program, args, env, working_dir, port_forward)
     }
 
     pub fn upload_directory(
@@ -1006,7 +998,6 @@ pub(crate) trait RemoteConnection: Send + Sync {
         args: &[String],
         env: &HashMap<String, String>,
         working_dir: Option<String>,
-        activation_script: Option<String>,
         port_forward: Option<(u16, String, u16)>,
     ) -> Result<CommandTemplate>;
     fn connection_options(&self) -> SshConnectionOptions;
@@ -1373,7 +1364,6 @@ mod fake {
             args: &[String],
             env: &HashMap<String, String>,
             _: Option<String>,
-            _: Option<String>,
             _: Option<(u16, String, u16)>,
         ) -> Result<CommandTemplate> {
             let ssh_program = program.unwrap_or_else(|| "sh".to_string());