fix/opted out phone numbers in pinpoint

[sastels]

Summary | Résumé

The Pinpoint boto call throws an exception if we try to send to a phone number that has opted out. (SNS will accept the boto call and later log that the number has opted out).

Related Issues | Cartes liées

• https://app.zenhub.com/workspaces/notify-planning-core-6411dfb7c95fb80014e0cab0/issues/gh/cds-snc/notification-planning-core/370

Test instructions | Instructions pour tester la modification

0. Make sure Pinpoint is configured.
1. Send yourself a text.
2. Reply "STOP" to opt out.
3. After ten or so seconds send yourself another text.
4. Within a few seconds the status of the notification should be "Phone number is opted out".
5. In staging or locally reply "START" to opt back in.

Release Instructions | Instructions pour le déploiement

None.

Reviewer checklist | Liste de vérification du réviseur

• This PR does not break existing functionality.
• This PR does not violate GCNotify's privacy policies.
• This PR does not raise new security concerns. Refer to our GC Notify Risk Register document on our Google drive.
• This PR does not significantly alter performance.
• Additional required documentation resulting of these changes is covered (such as the README, setup instructions, a related ADR or the technical documentation).

⚠ If boxes cannot be checked off before merging the PR, they should be moved to the "Release Instructions" section with appropriate steps required to verify before release. For example, changes to celery code may require tests on staging to verify that performance has not been affected.

[ben851]

yup