Add more resilience because moving to a managed service was more complex than anticipated

https://hee-tis.atlassian.net/browse/TIS21-489

Review Applicants & Notifications that might need to be generated

Joseph (Pepe) Kelly Most dropped events were for placements that have started and so were disregarded as they would not have produced applicant records eligible for sending to ESR. We also found:

• 1 record that had recovered, creating the necessary APP record

• 1 record that a notification (to send Feb '22) that was

• New post hasn’t been notified to trusts: MER/REM21/006/HT/001. We will ask the regional lead if Trusts can be contacted manually

• There were additional unconfigured attempts for some notifications, e.g. correlation id: 6e004633-6e34-426b-94b3-69b2adfbb51c