The plugin uninstall wp-cli command generate an error

[zaerl]

Prerequisites

• I have carried out troubleshooting steps and I believe I have found a bug.
• I have searched for similar bugs in both open and closed issues and cannot find a duplicate.

Describe the bug

The wp-cli uninstall __name__ blueprint step exits with an error.

https://playground.wordpress.net/builder/builder.html#{%22login%22:true,%22landingPage%22:%22/wp-admin/plugins.php%22,%22steps%22:[{%22step%22:%22wp-cli%22,%22command%22:%22wp%20plugin%20uninstall%20hello%20--deactivate%22}]}

Expected behavior

It should deactivate and then delete the plugin.

Actual behavior

It output this error on devtools:

 #!/usr/bin/env php
Ran uninstall procedure for 'hello' plugin. Deletion of plugin files failed

Steps to reproduce

1. Open the link
2. Check the error on the devtools

Isolating the problem

• I have deactivated other plugins and confirmed this bug occurs when only this plugin is active.
• This bug happens with a default WordPress theme active.
• I can reproduce this bug consistently using the steps above.

[Utsav-Ladani]

@zaerl, the reason behind this was the absence of rm command support in the sandbox spawn handler. I've added it with this PR. However, you'll still encounter the error message because Hello Dolly is already an inactive plugin, but it will be deleted. Passing the --deactivate flag will cause WP CLI to issue a warning as an error.

On the other hand, if you use the following blueprint, there won't be any issues.

{
  "login": true,
  "landingPage": "/wp-admin/plugins.php",
  "steps": [
    {
      "step": "wp-cli",
      "command": "wp plugin uninstall hello"
    }
  ]
}