Settings: don't try to allow NLSes with too-long component names

* NotificationAccessConfirmationActivity (triggered through CompanionDeviceManager) -> Don't show the dialog, bail out early similarly to other invalid inputs.
* NotificationAccessSettings (from Special App Access) -> No changes, but use the canonical constant now.
* NotificationAccessDetails -> Disable the toggle, unless the NLS was previously approved (in which case it can still be removed).

Fixes: 260570119
Fixes: 286043036
Test: atest + manually
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:f1af8c529295c60e516b2cc1d1ac812b8d6047ac)
Merged-In: Ifc048311746c027e3683cdcf65f1079d04cf7c56
Change-Id: Ifc048311746c027e3683cdcf65f1079d04cf7c56