Remove workflow that doesnt work for other forks

[mgarbs]

This PR adds the ability for the assign hip number and rename file worklow to work with forks

• Use pull_request_target to handle PRs from forks with base repo permissions
• Checkout both head and base repositories for accurate diff and reference
• Identify new HIP files in the PR and assign HIP numbers based on PR number
• Rename new HIP files to include assigned HIP numbers
• Commit and push changes back to the PR branch