Replace hard-coded bedtime action with Settings.ACTION_BEDTIME_SETTINGS

package com.android.settings.display.darkmode;

import static android.provider.Settings.ACTION_BEDTIME_SETTINGS;

import android.content.Context;

import android.content.Intent;

import android.content.pm.PackageManager;

import android.content.pm.ResolveInfo;

import androidx.annotation.Nullable;

import androidx.annotation.VisibleForTesting;

/** Manages Digital Wellbeing bedtime settings' intents. */

public final class BedtimeSettings {

    @VisibleForTesting

    public static final String ACTION_BEDTIME_SETTINGS = "android.settings.BEDTIME_SETTINGS";

    private final Context mContext;

    private final PackageManager mPackageManager;

    private final String mWellbeingPackage;

package com.android.settings.testutils;

import static com.android.settings.display.darkmode.BedtimeSettings.ACTION_BEDTIME_SETTINGS;

import static android.provider.Settings.ACTION_BEDTIME_SETTINGS;

import static org.robolectric.Shadows.shadowOf;