Switch to onDidStartTerminalShellExecution from the obsolete proposed API terminalData* events

[Garrett Serack (fearthecowboy)]

Fixes #12575

This stops the use of the proposed deprecated API and uses the newer, released TerminalShellExecution support.

[Bob Brown (bobbrow)]

Looks good to me. I'll let someone else on the team approve though.

[Sean McManus (sean-mcmanus)]

Does anyone know how to test this?

[Sean McManus (sean-mcmanus)]

Should this be void handleTerminalOutput(data).catch(logAndReturn.undefined);?

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[Colen Garoutte-Carson (Colengms)]

(copilot)
I took over the branch, merged current main, resolved the conflict in Extension/.scripts/common.ts, and pushed commit 1780f07. The resolution keeps main's lmTools DTS check and removes the obsolete terminalDataWriteEvent DTS check as intended by this PR.

I also addressed the outstanding promise-handling comment by changing the stream loop to await handleTerminalOutput(data). Awaiting here is preferable to fire-and-forget plus .catch(...): the old implementation serialized terminal chunks through terminalDataHandlingQueue, and awaiting each chunk preserves that ordering for async interactors (password/passphrase/host-key prompts). Targeted ESLint and the TypeScript project build both pass.

There are still compatibility/behavior concerns that I don't think we should overlook before approving the migration:

1. onDidStartTerminalShellExecution became stable in VS Code 1.93, but this extension currently declares engines.vscode as ^1.77.0 (recently reaffirmed by Update minimum VS Code version to 1.77 and vscode-languageclient to 9.0.1 #14502). Removing the proposed API means this path is not available on supported VS Code 1.77-1.92 installations.
2. The stable event depends on terminal shell integration. Users can disable shell integration, and VS Code documents that automatic injection may not work with custom shell arguments or other unsupported setups.
3. This runner always supplies custom arguments (/bin/sh -c ... or cmd.exe /c ...). It also intentionally uses cmd.exe on Windows, while VS Code's documented automatic shell-integration set on Windows is PowerShell and Git Bash, not cmd.exe.
4. TerminalShellExecution.read() only captures data after read() is first called. If no shell-execution event is emitted, this code receives no output at all, so SSH password/passphrase/host-key interactors cannot respond and stdout is empty. The old raw terminal-data event did not depend on shell integration.

Before merging, I recommend manually/integration testing at least:

• Windows with the current cmd.exe /c path.
• Linux/macOS with the current /bin/sh -c path.
• Shell integration enabled and disabled.
• Password, passphrase, host-key confirmation, cancellation, and normal stdout/exit-code flows.
• VS Code 1.77 (or deciding to raise the declared minimum to 1.93+) and current stable VS Code.

If those cases confirm the concern, the options appear to be retaining the proposed raw-data API as a compatibility fallback, raising the minimum VS Code version and redesigning command launch around TerminalShellIntegration.executeCommand, or pursuing a larger non-terminal output-capture design. An unconditional event-name replacement is unlikely to be behaviorally equivalent.