GHAS. Fix Insecure randomness

[giancorderoortiz]

Fixes https://github.com/SAP/spartacus/security/code-scanning/49

To fix the problem, we need to replace the use of Math.random() with a cryptographically secure random number generator. In a browser environment, we can use crypto.getRandomValues to generate secure random values. This method provides a cryptographically secure way to generate random numbers.

We will:

1. Import the necessary crypto module.
2. Replace the Math.random() call with crypto.getRandomValues to generate a secure random value.
3. Convert the generated random value to a string format similar to the original implementation.

Suggested fixes powered by Copilot Autofix. Review carefully before merging.