CCM-12685: Validate routing config submit and move child templates to SUBMITTED

[ClareJonesBJSS]

Description

• Retrieve routing config before submit (implicitly validating name etc via zod parsing)
• Explicitly check for null defaultTemplateIds
• Retrieve and validate all referenced templates
• Move all templates not in a SUBMITTED state to SUBMITTED as part of the txn

Removes the option of null language/accessibility templateIds, as this was not actually being leveraged and getting rid simplifies both this validation and core events

Context

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming
• If I have used the 'skip-trivy-package' label I have done so responsibly and in the knowledge that this is being fixed as part of a separate ticket/PR.

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Sensitive Information Declaration

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.