Better associate terminal with sessions

[anthonykim1]

From: #312873 (comment) and also comments in the mentioned PR.

[anthonykim1]

vscode/src/vs/sessions/contrib/terminal/browser/sessionsTerminalContribution.ts

Lines 157 to 159 in 5d0e061

	// Close terminals for archived/removed sessions, but only when no other
	// live session still owns that cwd. Terminals are reused across sessions
	// at the same cwd, so a plain cwd match would kill a terminal still in use