AIT: fix capture artifact when multiple AITs fail

[meiao]

Description

When an AIT fails, we capture some info about the test. This info is captured using the upload-artifact action.
The step that does it is:

      - name: Capture testing artifacts
        if: ${{ failure() || success() }}
        uses: actions/upload-artifact@65462800fd760344b1a7b4382951275a0abb4808 # pin@v4
        with:
          name: ${{ github.workflow }}-${{ github.job }}-${{ env.MATRIX }}
          path: |
            agent-integration-tests/testing-artifacts/*

But during execution, it looks like the name is not being properly populated.

github.workflow seems to resolve to Test Suite - PR, github.job to tests, but it looks like ${{env.MATRIX}} is not populating as we would expect.

Acceptance Criteria

Captured test artifacts have the correct name, matching the test being run.

[workato-integration]

https://new-relic.atlassian.net/browse/NR-293730