Option to supress gift related events to dataLayer when on eCard pages

[StoneMoney]

@bryancasler has conducted preliminary QA already

• For task: https://app.productive.io/2650-4site-interactive-studios-inc/tasks/16619272
• Adds new option in configuration SupressPurchaseEcard (default false, will not change any existing installations)
• When page type is ECARD and this SupressPurchaseEcard is true, DataLayer module will not report the EN_SUCCESSFUL_DONATION event or record payment-related pageJson values to EN_PAGEJSON_XXXX

Testing Process

1. Use GTM tag assistant for ats.org, pointed to this page: https://secure.ats.org/page/93557/donate/1
2. Complete the donation form, tick the box that the gift is in honor, and fill out the ecard data, and submit the form

• Video preview of this process available in this task comment

3. Check the tag assistant that the ECard Page does not have a EN_SUCCESSFUL_DONATION event
4. Check the tag assistant that the ECard Page pageJsonVariablesReady's event does not contain any gift process variables

Gift process variables:
* amount
* currency
* donationLogId
* feeCover
* giftProcess
* paymentType
* receiptNumber
* recurring
* transactionId
* transactionType

5. Test functionality again but with SuppressPurchaseEcard set to false; events should not be suppressed.