tailscale: update tailfs file and package names (#11590)

This change updates the tailfs file and package names to their new
naming convention.

Updates #tailscale/corp#16827

Signed-off-by: Charlotte Brandhorst-Satzkorn <charlotte@tailscale.com>

drive/remote_unix.go

@@ -0,0 +1,16 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build unix
+
+package drive
+
+import "tailscale.com/version"
+
+func doAllowShareAs() bool {
+	// All UNIX platforms use user servers (sub-processes) to access the OS
+	// filesystem as a specific unprivileged users, except for sandboxed macOS
+	// which doesn't support impersonating users and instead accesses files
+	// through the macOS GUI app as whatever unprivileged user is running it.
+	return !version.IsSandboxedMacOS()
+}