[ECM] Implement EnhancedConfirmationDialog in PC

The dialog currently used by ECM to show the "Restricted setting" dialog
(which gets displayed when a user tries to perform a restricted
operation) is currently ActionDisabledByAppOpsDialog, which is hosted
in Settings.

We want to move this dialog out of Settings and into
PermissionController.

The existing dialog is also used for other features, so: (1) we won't
delete the existing dialog, and (2) we can remove some code in the new
dialog.

This change essentially does the following:

1. Copy the dialog from Settings into PermissionController
2. Rename things to reflect the dialog's new name:
   EnhancedConfirmationDialog
3. Use ECM-for-V behavior: call setClearRestrictionAllowed instead of
   setting an appop directly
4. Remove unused code and resources

Note that nothing is pointing at this new dialog just yet.

To test opening the dialog manually, run:

    (EXTRA_PACKAGE_NAME='com.android.chrome';
    EXTRA_UID=$(adb shell pm list packages -U \
        | grep ${EXTRA_PACKAGE_NAME} | sed 's/.*uid://');
    adb shell am start \
        -a android.app.ecm.action.SHOW_ECM_RESTRICTED_SETTING_DIALOG \
        -e android.intent.extra.PACKAGE_NAME ${EXTRA_PACKAGE_NAME} \
        --ei android.intent.extra.UID ${EXTRA_UID})

LOW_COVERAGE_REASON=other: Not in use yet. Will add tests in follow-up.
Bug: 322026141
Test: see above
Change-Id: I3fb866e06146c830b3daf38c0dd194538dfd239b