Open current working directory action.

[michaeljsXu]

Summary of the Pull Request

Added open current directory action.

References and Relevant Issues

Need to set this: https://learn.microsoft.com/en-us/windows/terminal/tutorials/new-tab-same-directory

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed

• Ensure shell has been configured
• Run "Open current working directory" action in command palette
• File explorer opens the correct directory

PR Checklist

• [x] Closes #12859
• [ ] Tests added/passed
• [ ] Documentation updated
  • If checked, please file a pull request on our docs repo and link it here: #xxx
• [ ] Schema updated (if necessary)

[michaeljsXu]

@microsoft-github-policy-service agree

[lhecker]

Oh, it seems this PR fell off our radar...