fix: DTOSS-10762 CD Pipeline conditions improvement

[patrickmoore-nc]

Description

• CD pipeline improvement: don't launch db_changes_stage or restart_functions_stage unless Terraform Apply or the ACR re-tagging ran successfully. Prevents unexpected restarts when simply running a Terraform Plan.
• Other conditional logic simplifications.
• For clarity, added conditional displayname for the terraform_deploy stage, so that it's labelled Terraform Plan if no apply is selected when initiating the pipeline.

Testing

Tested in branch:
https://dev.azure.com/nhse-dtos/dtos-cohort-manager/_build/results?buildId=26639&view=results

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

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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.

[github-actions]

Unit Test Results

✔️ Tests 777 / 777 - passed in 63.2s
📝 Coverage 56.95%
📏 4288 / 7414 lines covered 🌿 1055 / 1968 branches covered
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✏️ updated for commit d6a7785

[sonarqubecloud]

Quality Gate passed

Issues
0 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

[MacMur85]

Approved