Update Secure Product Design Cheat Sheet

[Prasad-JB]

This PR updates the Secure Product Design Cheat Sheet to clearly outline the principles and focus areas required for designing secure products.

Changes include:

• Security principles: Least Privilege, Defense-in-Depth, Zero Trust, Security-in-the-Open
• Security focus areas: Context, Components, Connections, Code, Configuration
• Guidance on secure defaults, minimizing attack surfaces, and failing securely
• References to relevant cheat sheets like Threat Modeling, Infrastructure as Code, and Abuse Cases

This PR is separate from the ASVS Index updates to maintain clarity and modular contribution.

[mackowski]

this change does not makes sense I am closing this PR