Add the display approver first name attribute in email template

Summary: We are using SSO login for our CPQ Login which is using the email address of the user. We have build approval email template where we are sending the email to approver and want to use the first name of the approver but we have only "Next Approver Login " attribute available which is storing the email id and this is not available in library function. so we are not able to use to fetch the first name.

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