Update copy code to also copy Welsh

[chao-xian]

What problem does this pull request solve?

FormCopyService was only copying the English version of a form and ignoring if the form has a Welsh translation. This PR now copies both (if a Welsh version exists).

Trello card: https://trello.com/c/t30RB6CI/2759-needed-before-launch-update-copy-form-to-work-with-welsh-forms

Things to consider when reviewing

• Ensure that you consider the wider context.
• Does it work when run on your machine?
• Is it clear what the code is doing?
• Do the commit messages explain why the changes were made?
• Are there all the unit tests needed?
• Do the end to end tests need updating before these changes will pass?
• Has all relevant documentation been updated?

[sonarqubecloud]

Quality Gate passed

Issues
13 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud

[github-actions]

🎉 A review copy of this PR has been deployed! You can reach it at: https://pr-2476.admin.review.forms.service.gov.uk/

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[DavidBiddle]

Works for me in review and the code looks good 🎉