Remove E2E Tests

[adam-wallernhs1]

Description

End to End Tests have been successfully moved to https://github.com/[NHSDigital/eligibility-signposting-api-regression-tests](https://github.com/NHSDigital/eligibility-signposting-api-regression-tests/)/ so need removing from this repo

Context

Type of changes

• [ x ] Refactoring (non-breaking change)

Checklist

• [ x ] I am familiar with the contributing guidelines
• [ x ] I have followed the code style of the project
• [ x ] I have added tests to cover my changes
• [ x ] I have updated the documentation accordingly
• [ x ] This PR is a result of pair or mob programming

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Sensitive Information Declaration

To ensure the utmost confidentiality and protect your and others privacy, we kindly ask you to NOT including PII (Personal Identifiable Information) / PID (Personal Identifiable Data) or any other sensitive data in this PR (Pull Request) and the codebase changes. We will remove any PR that do contain any sensitive information. We really appreciate your cooperation in this matter.

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