[PERFORMANCE] PAT Build improvement

[Helix] merge 2.2 into 2.2-develop

[EngCom] Public Pull Requests - 2.2-develop
 - MAGETWO-85694: [2.2 Backport] Create CODE_OF_CONDUCT.md #12723

 - Merge Pull Request magento/magento2#12723 from ishakhsuvarov/magento2:github-specific-documents
 - Merged commits:
   1. f69dd0fd
   2. 104faf3c
   3. 3d2e1eb5

Public Pull Requests
 - magento/magento2#11563 Add price calculation improvement for product option value price by @marinagociu
 - magento-engcom#1024 [Backport] magento/magento2#10734: Magento 2 is not showing Popular Search Terms by @p-bystritsky
 - magento-engcom#1023 magento/magento2#12667: Incorrect partial attribute (EAV) reindex (Update by Schedule) for configurable product with childs visibility "Not Visible Individually" by @RomaKis
 - magento-engcom#1017 magento/magento2#12084: Product csv import > fail on round brackets in image filename by @p-bystritsky
 - magento-engcom#1021 magento/magento2#12656: Checkout: Whitespace in front of coupon code causes "Coupon code is not valid" by @RomaKis
 - magento/magento2#12666 Fix incorrect DHL Product codes by @gwharton

Fixed Public Issues
 - magento/magento2#5774 Tier price and custom options give bad results
 - magento/magento2#10743 Magento 2 is not showing Popular Search Terms
 - magento/magento2#12667 Incorrect partial attribute (EAV) reindex (Update by Schedule) for configurable product with childs visibility "Not Visible Individually"
 - magento/magento2#12084 Product csv import > fail on round brackets in image filename
 - magento/magento2#12656 Checkout: Whitespace in front of coupon code causes "Coupon code is not valid"

MAGETWO-85610: magento/magento2#12656: Checkout: Whitespace in front of coupon code causes "Coupon code is not valid" #1021

MAGETWO-85629:  magento/magento2#12084: Product csv import > fail on round brackets in image filename #1017

MAGETWO-85634: magento/magento2#12667: Incorrect partial attribute (EAV) reindex (Update by Schedule) for configurable product with childs visibility "Not Visible Individually" #1023

MAGETWO-85637: [Backport] magento/magento2#10743: Magento 2 is not showing Popular Search Terms #1024

MAGETWO-85637: [Backport] magento/magento2#10743: Magento 2 is not showing Popular Search Terms #1024

 - Merge Pull Request magento-engcom/magento2ce#1024 from p-bystritsky/magento2:ISSUE-10734
 - Merged commits:
   1. 1f77aaad
   2. e3403473
   3. 43ede3ca

 - Merge Pull Request magento/magento2#11563 from marinagociu/magento2:fix-custom-option-price
 - Merged commits:
   1. 33aa293e
   2. 7ff22bf3

MAGETWO-85610: Merge branch '2.2-develop' of github.com:magento/magento2ce into MAGETWO-85610-magento-engcom-magento2ce-1021