PDP-536: Adding copyright check

[SameeraPriyathamTadikonda]

No description provided.

[Copilot]

Pull Request Overview

This PR adds copyright header validation to the project's CI/CD pipeline. The implementation uses a reusable workflow from marklogic/pr-workflows to automatically check for proper copyright headers on pull requests.

Key changes:

• Integrates copyright validation workflow into existing PR checks
• Configures exclusions for build files, documentation, and CI configuration files

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

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

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