Revert "feat: adding docs change validation step in reuseable CI (#390)"

[siddharth-khatsuriya]

This reverts commit e30a821.

Description

This PR reverts the previous implementation of documentation validation and enforcement, and reintroduces those capabilities using a reusable GitHub Actions workflow along with a template validate-deploy-docs.yml workflow file in the template repository.

Changes with PR reference

• Removes the hardcoded docs validation logic.
• Adds the reusable-validate-deploy-docs workflow to the repository, introduced via this PR in addonfactory-workflow-addon-release.
• Introduces a standard validate-deploy-docs.yml template workflow in the template repository for consistent documentation handling across addons via this PR in addonfactory-repository-template.

Checklist

• README.md has been updated or is not required
• push trigger tests
• manual release test
• automated releases test
• pull request trigger tests
• schedule trigger tests
• workflow errors/warnings reviewed and addressed

Testing done

(for each selected checkbox, the corresponding test results link should be listed here)