NPA-6521: Investigate hanging sandbox check

[hatwell]

Pull Request

🧾 Ticket Link

https://nhsd-jira.digital.nhs.uk/browse/NPA-6521

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📄 Description/Summary of Changes

• The job was not showing as completed because some processes in the Flask group weren't being killed at the end of the test run. This change updates the commands to enable job control (set -m) which places all the Flask processes in a process group. It then gracefully shuts down all the processes in that process group.

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🧪 Developer Testing Carried Out

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📋 PR Principles

• Keep PRs Small and Focused: Ensure the PR addresses a single task or feature to make it easier to review.
• Multiple PRs for one Ticket: When splitting work into multiple PRs, clearly describe what this PR addresses and outline the remaining work to complete the ticket.
• Ensure Tests Are Included: Add or update unit, integration, or end-to-end tests to cover the changes made.
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🏷️ Naming Conventions Reminder

Please ensure the following naming conventions are followed:

• PR title follows the format: NPA-XXXX: <short-description>
• Branch name follows the convention: <type>/NPA-XXXX/<short-description>
• Commit messages follow the template: NPA-XXXX: <short-description>

[github-actions]

This branch is work on a ticket in the NHS Digital NPA JIRA Project. Here's a handy link to the ticket:

NPA-6521

[github-actions]

This branch is work on a ticket in the NHS Digital NPA JIRA Project. Here's a handy link to the ticket:

NPA-6521

[github-actions]

This branch is work on a ticket in the NHS Digital NPA JIRA Project. Here's a handy link to the ticket:

NPA-6521