Update concurrency group for pr label workflow

[adimoldovan]

Submission Review Guidelines:

• I have followed the WooCommerce Contributing Guidelines and the WordPress Coding Standards.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have reviewed my code for security best practices.
• Following the above guidelines will result in quick merges and clear and detailed feedback when appropriate.

Changes proposed in this Pull Request:

Updated the concurrency group for the PR labeller workflow to something unique to the PR. For pull_request_target trigger the github.ref value is the base branch, making the group name for PRs from the same base branch identical. The effect is that 'Label Pull Request Project' running on one PR could cancel the same workflow running for another PR.

How to test the changes in this Pull Request:

Using the WooCommerce Testing Instructions Guide, include your detailed testing instructions:

1. Need two PRs for branches with same base branch.
2. Update one branch so that 'Label Pull Request Project' starts.
3. Update the second branch so that 'Label Pull Request Project' starts in parallel to the previous one.

The first workflow should not be cancelled.

Changelog entry

• Automatically create a changelog entry from the details below.

Significance

• Patch
• Minor
• Major

Type

• Fix - Fixes an existing bug
• Add - Adds functionality
• Update - Update existing functionality
• Dev - Development related task
• Tweak - A minor adjustment to the codebase
• Performance - Address performance issues
• Enhancement - Improvement to existing functionality

Message

Comment

[github-actions]

Test Results Summary

Commit SHA: 64e440e

Test 🧪	Passed ✅	Failed 🚨	Broken 🚧	Skipped ⏭️	Unknown ❔	Total 📊	Duration ⏱️
API Tests	259	0	0	2	0	261	0m 38s
E2E Tests	319	0	0	49	0	368	9m 4s

---

To view the full API test report, click here.
To view the full E2E test report, click here.
To view all test reports, visit the WooCommerce Test Reports Dashboard.

[github-actions]

Hi , @woocommerce/vortex

Apart from reviewing the code changes, please make sure to review the testing instructions as well.

You can follow this guide to find out what good testing instructions should look like:
https://github.com/woocommerce/woocommerce/wiki/Writing-high-quality-testing-instructions

[rrennick]

LGTM