FE-006: Add concurrency cancellation for redundant PR runs

[Tobiloba0]

Closes #795

Description

This PR implements concurrency cancellation for GitHub Actions workflows to prevent redundant PR runs from consuming resources unnecessarily.

Previously, multiple workflow runs could continue executing when new commits were pushed to the same pull request. This change ensures that older in-progress runs are automatically cancelled when a newer run is triggered.

Changes Made

• Added GitHub Actions concurrency configuration to PR workflows.
• Enabled automatic cancellation of outdated workflow runs using cancel-in-progress: true.
• Applied concurrency grouping based on workflow name and Git reference.

Implementation

Added:

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

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