chore: replace local actions and workflows with shared org-level equivalents

[Schmarvinius]

Replace local composite actions and reusable workflows with their shared equivalents from cap-java/.github to reduce maintenance overhead.

Actions to replace

• build → cap-java/.github/actions/build
• deploy-release → cap-java/.github/actions/deploy-release
• scan-with-codeql → cap-java/.github/actions/scan-with-codeql
• scan-with-blackduck → cap-java/.github/actions/scan-with-blackduck
• cf-bind → use cap-java/.github/actions/cf-login for CF steps

Workflows to replace

• issue.yml → delegate to cap-java/.github/.github/workflows/issue.yml
• stale.yml → delegate to cap-java/.github/.github/workflows/stale.yml
• prevent-issue-labeling.yml → delegate to cap-java/.github/.github/workflows/prevent-issue-labeling.yml

Kept local (project-specific)

• scan-with-sonar (multi-step build with CF binding + multiple coverage paths)
• integration-tests (no shared equivalent)

[github-actions]

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