VED-775 Refactor redis_sync

[JamesW1-NHS]

Summary

• Routine Change

As part of code restructuring.

Refactor the redis_sync lambda into lambdas/ and shared/ folders.

Source files which can move to shared:

authentication
clients
log_decorator
s3_event (as subclass of AwsLambdaEvent)
s3_reader

Reviews Required

• Dev
• Test
• Tech Author
• Product Owner

Review Checklist

ℹ️ This section is to be filled in by the reviewer.

• I have reviewed the changes in this PR and they fill all or part of the acceptance criteria of the ticket, and the code is in a mergeable state.
• If there were infrastructure, operational, or build changes, I have made sure there is sufficient evidence that the changes will work.
• I have ensured the changelog has been updated by the submitter, if necessary.

[github-actions]

This branch is working on a ticket in the NHS England VED JIRA Project. Here's a handy link to the ticket:

VED-775

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
90.7% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud