[EngCom] Public Pull Requests - 2.2-develop

Accepted Public Pull Requests:
 - magento/magento2#13034: Magento 2.2 Develop fix for #12221 Google Analytics Pageview Triggered twice (by @bhargavmehta)
 - magento/magento2#13036: magento/magento2#12705: Integrity constraint violation error after re… (by @vinayshah)
 - magento/magento2#13044: Fix Newsletter Subscribe Workflow (by @torhoehn)
 - magento/magento2#12668: Fix for reverting stock twice for cancelled orders (by @dverkade)
 - magento-engcom/magento2ce#1018: 6486: Unable to save certain product properties via Rest API (by @nmalevanec)


Fixed GitHub Issues:
 - magento/magento2#12221: Google analytics pageview being triggered twice (reported by @alexhadley) has been fixed in magento/magento2#13034 by @bhargavmehta in 2.2-develop branch
   Related commits:
     1. 149d08fb
     2. e851948a

 - magento/magento2#12705: Integrity constraint violation error after reordering product with custom options (reported by @alena-marchenko) has been fixed in magento/magento2#13036 by @vinayshah in 2.2-develop branch
   Related commits:
     1. 843bc622
     2. f89e04d8
     3. df96b512

 - magento/magento2#12876: Multiple newsletter confirmation emails sent (reported by @nfourteen) has been fixed in magento/magento2#13044 by @torhoehn in 2.2-develop branch
   Related commits:
     1. 9ab75bae
     2. 93453a81

 - magento/magento2#9969: Cancel order and restore quote methods increase stocks twice (reported by @simpleadm) has been fixed in magento/magento2#12668 by @dverkade in 2.2-develop branch
   Related commits:
     1. 2c1d6a4d

 - magento/magento2#6486: Unable to save certain product properties via Rest API (reported by @cherreman) has been fixed in magento-engcom/magento2ce#1018 by @nmalevanec in 2.2-develop branch
   Related commits:
     1. fa6782f3
     2. 9db02736
     3. 1d37cce4
     4. de673880
     5. d132c7ec