RTI-18 : Add Script for Checkmarx scanning

[repl-neha-belwal]

Description

• Checkmarx Code Scan is a Static Application Security Testing (SAST) solution used to analyze static source code for potential security vulnerabilities.
• At this stage, the integration is limited to adding the scan into the GitHub Actions workflow. It is not yet configured as a required check for merging. The next phase will focus on reviewing and addressing the scan results.
• This PR does not introduce any changes to the codebase and contains no breaking changes. Although the security scan checks may currently be failing, this PR is safe to merge.

For changes in ratelimit to take effect in REAP or IaC envoy additional PR's are required in the linked locations