This reverts commit 0f0b0a12aa.
#134189 refused plugin update, remove/uninstall and force-reinstall on every
platform whenever the profile gateway was live, so uninstalling a plugin
(notably on Windows, from Desktop) required shutting the gateway down. The
#70473 hazard it guarded (deferred imports in a loaded plugin hitting a
swapped checkout) does not justify blocking uninstall; it will be re-landed
scoped to the paths that need it.