NPA-6620: Validate IAL3 as well as AAL3

[ehallam]

Pull Request

🧾 Ticket Link

https://nhsd-jira.digital.nhs.uk/browse/NPA-6620

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📄 Description/Summary of Changes

• Added the proxy updates as specified in the ticket

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🧪 Developer Testing Carried Out

• Tested it against internal-dev with the new proxy updates using AAL1, AAL2 and AAL3, and only AAL3 works like expected
• We already rejected these requests before this change too

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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.
• Follow Coding Standards: Ensure the code adheres to the team's coding guidelines and best practices.
• Resolve Comments Promptly: If you raise a comment, ensure you follow up and resolve it before approving the PR to maintain clarity and ensure comments are addressed.
• Foster Learning: PR reviews are an opportunity to share knowledge, provide constructive feedback, and encourage a collaborative environment.

🏷️ 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-6620