Task - ITVR pre-approval message content update

**Describe the task**
The Business Area wants the pre-approval rebate email content to have an accurate 'expiration date' that reflects upcoming changes to the rebate program. The current email to the applicant states "This rebate approval will expire one year from today's date". The Business Area has updated language for us to use.

The exact date this change needs to go live is TBD, but estimated to be May 1st.

**Purpose**
This action needs to be done to ensure the public receives accurate information regarding their rebate application that reflects the changes to the LDV rebate program.

**Acceptance Criteria**
- [x] The auto-generated rebate message has an updated expiration date that reflects the business areas direction.

**Additional context**
- When this ticket starts, reach out to the PO for the desired language.