chore: optimize cargo metadata command execution

[0xsenty]

Description

cargo metadata command was being executed twice with the same parameters, which resulted in redundant operations and unnecessary load, to address this, I've modified the script to run the cargo metadata command just once, saving the result into a variable and reusing it for further processing.

this should improve the script's efficiency and reduce unnecessary computations.

Checklist before requesting a review

• I have added an entry to CHANGELOG.md
• I have commented on my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules