Implement hook_update_8300

Create only field can be automatically upgraded:

FROM:

    $create_only_fields = [
      'allowAnchor',
      'alwaysSendReferrer',
      'clientId',
      'cookieName',
      'cookieDomain',
      'cookieExpires',
      'legacyCookieDomain',
      'legacyHistoryImport',
      'sampleRate',
      'siteSpeedSampleRate',
      'storage',
      'useAmpClientId',
      'userId',
    ];

TO:

    $create_only_fields = [
      'client_id',
      'cookie_name',
      'cookie_domain',
      'cookie_expires',
      'sample_rate',
      'site_speed_sample_rate',
      'use_amp_client_id',
      'user_id',
    ];

All non-existing params need to be wiped. We need to check again, if API additions may have done and some more 8.x-2.x settings came back.