Move run in terminal tool to core

[Daniel Imms (Tyriar)]

This PR moves the entirely of both the runInTerminal and getTerminalOutput tools (which depends on runInTerminal) into the core codebase. This was mostly a simple but tedious task, but the invoke calls in particular needed a decent amount of changes to move to the lower-level and richer APIs provided internally like ICommandDetectionCapability.

The goal was to do a straight conversion to reduce the risk of things going wrong, not to improve upon what we had yet. As such, the following debt tasks I'm tackling after this gets merged and we migrate successfully:

• Don't have invocation specific data as a member variable on the tool #255889
• Run in terminal tool should pass through a user edited command with a better name #256227
• Run in terminal tool should read directly from xterm.js buffer, not construct a new one #256229
• Run in terminal tool: review trackIdleOnPrompt implementation #256230

Part of #252650

---

TODO

• Should we bring back reattaching to sessions across reloads?
  • Added
• Is breaking getCopilotTerminals in the extension fine?
  • It's fine, also track non-copilot terminals in agent context vscode-copilot-chat#221 will come soon which will bring all terminal context, not just Copilot terminals
• Think through migration strategy from runInTerminal -> runInTerminal2
  • Plan at Move run in terminal tool to core #252650 (comment)