Update clipboard-related calls to use a Theia-compatible option

[traeok]

Is your feature request related to a problem? Please describe.

Currently, the Clipboard browser API is considered experimental and must be enabled in order to perform copy/paste actions within Theia. Without enabling this feature through the browser, users will be unable to copy and paste DS members and USS files/folders.

Describe the solution you'd like

Use an alternative method to manage clipboard data, specifically one that would work with Theia out-of-the-box.
This would also fix other VScode "cloud platforms" that would need the experimental clipboard API for these same operations.

Describe alternatives you've considered

• Global clipboard variable/object
  • Would not be ideal for ZE extenders
• Class for clipboard management in ZE API
  • Will be straightforward for ZE extenders to adopt

Both of these will add to the memory footprint used in ZE, but will be worth it for compatibility, and will also give us the ability to copy/paste binary objects within ZE (as currently the only clipboard API in VS code is for writing text)

[github-actions]

Thank you for raising this issue.
The community has 90 days to upvote 👍 the issue.
If it receives 10 upvotes, we will move it to our backlog. If not, we will close it.

[github-actions]

Thank you for creating a bug report. If you haven't already, please ensure you have provided steps to reproduce it and as much context as possible.