Refactor Black Duck security scan workflow and update action versions

[tuxtof]

This pull request simplifies and consolidates the Black Duck security scan workflows in the GitHub Actions configuration. The main changes involve removing a redundant scheduled workflow, updating the scan action to use a newer version, and streamlining the configuration for easier maintenance.

Workflow consolidation and simplification:

• Removed the separate .github/workflows/synopsys-schedule.yaml file, eliminating the redundant scheduled Black Duck policy check workflow.
• Added a scheduled trigger (cron: "0 0 * * *") directly to the existing .github/workflows/synopsys.yaml workflow, ensuring daily scans are still performed without a separate workflow file.

Action and configuration updates:

• Replaced the deprecated synopsys-sig/synopsys-action@v1.13.1 with the newer blackduck-inc/black-duck-security-scan@v2.1.1 action, and updated all relevant configuration keys (e.g., from blackduck_url to blackducksca_url).
• Simplified the workflow by removing the custom check_approvals job and related conditional logic, focusing the workflow solely on security scanning.