Improve MASTG-DEMO-0059 and MASTG-DEMO-0058

[cpholguera]

This PR adds gitleaks as a new tool for secrets scanning in mobile app testing and improves the handling of sensitive data demonstrations in MASTG-DEMO-0059 and MASTG-DEMO-0058.

Key changes include:

• Introduction of gitleaks tool (MASTG-TOOL-0144) for detecting hardcoded credentials
• Enhanced MASTG-DEMO-0059 with more realistic secret formats and improved documentation
• Updated MASTG-DEMO-0058 with clearer explanations and evaluation scripts

[Copilot]

Pull Request Overview

This PR adds gitleaks as a new tool for secrets scanning in mobile app testing and improves the handling of sensitive data demonstrations in MASTG-DEMO-0059 and MASTG-DEMO-0058.

Key changes include:

• Introduction of gitleaks tool (MASTG-TOOL-0144) for detecting hardcoded credentials
• Enhanced MASTG-DEMO-0059 with more realistic secret formats and improved documentation
• Updated MASTG-DEMO-0058 with clearer explanations and evaluation scripts

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

File	Description
tools/generic/MASTG-TOOL-0144.md	Adds gitleaks tool documentation for secrets scanning
demos/android/MASVS-STORAGE/MASTG-DEMO-0059/	Updates demo with enhanced secret formats and comprehensive evaluation methods
demos/android/MASVS-CRYPTO/MASTG-DEMO-0058/	Improves demo documentation and adds evaluation script

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}