PDP-536: Adding copyright check

[SameeraPriyathamTadikonda]

No description provided.

[Copilot]

Pull Request Overview

This PR adds copyright header validation to the project by integrating a reusable copyright check workflow and configuring file exclusions.

• Adds a new copyright validation job to the existing PR workflow
• Creates a copyright configuration file to define validation rules and file exclusions
• Updates the workflow name for better clarity

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/pr-workflow.yaml	Adds copyright validation job and updates workflow name
.copyrightconfig	Defines copyright validation configuration with start year and file exclusions