feat: add email to A/B function (#44187)

* feat: add email to A/B function

* fix: declare types for sha-1

* Update client/src/utils/A-B-tester.ts

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

* feat: add custom dimesions for donation events

* feat: re-order if statemetns

* Apply suggestions from code review

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

* fix: assuage TypeScript

* update rename

* rename vars

* update naming

* re add types

* Update client/src/redux/ga-saga.js

Co-authored-by: Shaun Hamilton <shauhami020@gmail.com>

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>
Co-authored-by: Shaun Hamilton <shauhami020@gmail.com>

config/donation-settings.js

@@ -92,6 +92,11 @@ const donationUrls = {
 
 const patreonDefaultPledgeAmount = 500;
 
+const aBTestConfig = {
+  isTesting: true,
+  type: 'DistributionTest'
+};
+
 module.exports = {
   durationsConfig,
   amountsConfig,
@@ -105,5 +110,6 @@ module.exports = {
   paypalConfigTypes,
   paypalConfigurator,
   donationUrls,
-  patreonDefaultPledgeAmount
+  patreonDefaultPledgeAmount,
+  aBTestConfig
 };