VED-881: refactor constants for batch lambdas

[edhall-nhs]

Summary

• Routine Change

Consolidate and refactor constants shared across batch lambdas.

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 of the acceptance criteria of the ticket.
• If there were infrastructure, operational, or build changes, I have made sure there is sufficient evidence that the changes will work.
• If there were changes that are outside of the regular release processes e.g. account infrastructure to setup, manual setup for external API integrations, secrets to set, then I have checked that the developer has flagged this to the Tech Lead as release steps.
• I have checked that no Personal Identifiable Data (PID) is logged as part of the changes.

[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-881

[edhall-nhs]

Sonar code coverage for the new batch_constants file is causing it to fail the quality gate. We don't need any tests for this because it's just a file of constants so we'll see if we can approve and merge as is and if not then I'll put a coverage exclusion in the sonar properties file.

[dlzhry2nhs]

Ah no, it doesn't allow overriding the merge with coverage below a certain threshold. Might need to put an ignore on the file for now and then we can remove later.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud