PDP-536: Adding copyright check

[SameeraPriyathamTadikonda]

No description provided.

[Copilot]

Pull Request Overview

This PR adds copyright header validation to the existing GitHub Actions workflow. The change introduces automated copyright compliance checking for pull requests.

• Updates the workflow name from "JIRA ID Validator" to "PR Workflow" to reflect expanded functionality
• Adds a new copyright validation job that uses an external reusable workflow
• Creates a copyright configuration file to define validation rules and exclusions

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

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