Make remote mkdir shell-independent for compatibility (#32997)

- Closes: #30962 

Nushell does not support mkdir -p
So invoke sh -c "mkdir -p" instead which will also work under nushell.

Release Notes:

- Fixed ssh remotes running Nushell (and possibly other non
posix-compliant shells)

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/remote/src/ssh_session.rs

@@ -1805,7 +1805,16 @@ impl SshRemoteConnection {
     ) -> Result<()> {
         if let Some(parent) = tmp_path_gz.parent() {
             self.socket
-                .run_command("mkdir", &["-p", &parent.to_string_lossy()])
+                .run_command(
+                    "sh",
+                    &[
+                        "-c",
+                        &shell_script!(
+                            "mkdir -p {parent}",
+                            parent = parent.to_string_lossy().as_ref()
+                        ),
+                    ],
+                )
                 .await?;
         }
 
@@ -1877,7 +1886,16 @@ impl SshRemoteConnection {
     ) -> Result<()> {
         if let Some(parent) = tmp_path_gz.parent() {
             self.socket
-                .run_command("mkdir", &["-p", &parent.to_string_lossy()])
+                .run_command(
+                    "sh",
+                    &[
+                        "-c",
+                        &shell_script!(
+                            "mkdir -p {parent}",
+                            parent = parent.to_string_lossy().as_ref()
+                        ),
+                    ],
+                )
                 .await?;
         }