CORE-266: use GroupAccessRequestNotificationV2

[davidangb]

Ticket: https://broadworkbench.atlassian.net/browse/CORE-266

What:

When sending a group access request notification, use GroupAccessRequestNotificationV2 instead of the deprecated GroupAccessRequestNotification. This enforces, in code, that notifications only use a single reply-to address.

Context of the overall rollout plan to adopt the SendGrid v3 APIs by February 10:

1. [DONE] CORE-266: all email notifications use a single Reply-To address thurloe#369, which ensures all email notifications use a single reply-to~
2. [DONE] CORE-235, CORE-266: re-enable sendgrid-java 4.10.3 and corresponding syntax changes thurloe#368, which adopts the latest sendgrid-java and v3 APIs
3. [DONE] Modify workbench-libs to deprecate the GroupAccessRequestNotification used by Sam which allows multiple reply-tos; provide a replacement GroupAccessRequestNotificationV2 that only allows a single reply-to. See CORE-266: enforce a single reply-to address on group-access-request notifications workbench-libs#1717 (this PR)
4. [DONE] Support the new GroupAccessRequestNotificationV2 model in Thurloe. See CORE-235: support GroupAccessRequestNotificationV2 notifications thurloe#372
5. [this PR] Use the new GroupAccessRequestNotificationV2 model in Sam. After this step, Thurloe would no longer ignore the reply-to value sent by Sam; Sam would once again be in control of the reply-to.
6. Remove support for the deprecated GroupAccessRequestNotification from Thurloe
7. Delete the deprecated GroupAccessRequestNotification from workbench-libs

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PR checklist

• I've followed the instructions if I've made any changes to the API, especially if they're breaking changes
• I've filled out the Security Risk Assessment (requires Broad Internal network access) and attached the result to the JIRA ticket

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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