ci: enhance secret scanning with staged changes and complete history

[nhs-oliverslater]

Description

Introduce new hooks for secret scanning that cover both staged changes and the complete git history. The scan-secrets-staged-changes hook runs automatically on git commit, while the scan-secrets-whole-history hook scans the entire history during CI/CD processes.

Context

This change enhances security by providing a two-tiered approach to secret scanning, allowing for immediate detection of secrets in staged changes and comprehensive audits of the entire commit history.

Type of changes

• New feature (non-breaking change which adds functionality)

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

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.

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