PDP-536: Adding copyright check

[SameeraPriyathamTadikonda]

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[Copilot]

Pull Request Overview

This PR adds copyright header validation to the GitHub Actions workflow, introducing automated checking to ensure all source files contain proper copyright notices. The changes implement a reusable workflow from the marklogic organization and configure file exclusions for the copyright validation process.

• Updates the PR workflow to include copyright validation alongside existing JIRA ID validation
• Adds a configuration file to specify copyright validation rules and file exclusions

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 start year and file exclusions

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