Allow disabling automatic reconstruction of terminals #2563

[danthe1st]

Summary

This PR adds a preference to disable automatically restoring the open terminals in the terminal view.

Demonstration steps:

• Open Eclipse
• Open a terminal view with multiple terminals
• Close Eclipse while the terminal view is open
• Open Eclipse again
• After navigating to the terminal view, all terminals are restored.

This PR adds a new preference in Window > Preferences > Terminal named Reopen terminals after restart which is checked by default. If unchecked, no terminals will be restored.

Notes

• The terminal preference screen is located in org.eclipse.terminal.control while the related logic is present in org.eclipse.terminal.view.ui. I don't know what the best way to expose these classes is as they are x-internal. For now, I added an x-friends (mainly for documentation) and marked the access with @SuppressWarnings("restriction").
• If you want to have a working terminal from a local "Eclipse Application" run configuration, you might need to add the org.eclipse.cdt.core.native and org.eclipse.cdt.core.<your OS/arch> bundles. I got them from the update site https://download.eclipse.org/releases/2026-09. This PR can still be tested without that but local terminals might just be empty rectangles without those.
  
  
• I assume a small preference addition like this doesn't need a N&N? If one is wanted, I can also create that.

Issues

Fixes #2563