Remove test-membership duplication (#1248)

The PR builder uses a local copy of an action which has [since been
centralised](https://github.com/hazelcast/hazelcast-tpm/blob/main/membership/action.yaml).

This was originally copied from the pattern in `hazelcast-nodejs-client`
- but this has [since been
migrated](https://github.com/hazelcast/hazelcast-nodejs-client/blob/master/.github/workflows/coverage_runner.yml#L16-L29).

Updated to use centralise version - allowing a central place to make
improvements.

Author: JackPGreen

.github/actions/test-membership/action.yml

@@ -39,21 +39,12 @@ jobs:
     name: Test Hazelcast Membership
     runs-on: ubuntu-latest
     outputs:
-      is-hazelcast: ${{ steps.test-membership.outputs.is-member }}
+      is-hazelcast: ${{ steps.test-membership.outputs.check-result }}
 
     steps:
-      # checkout the hazelcast/hazelcast-cpp-client repository
-      # bare minimum - just to use actions
-      - name: Checkout code
-        uses: actions/checkout@v4
-        with:
-          ref: ${{ inputs.ref }}
-          token: ${{ secrets.GH_TOKEN }}
-          submodules: false
-
       - name: Test
         id: test-membership
-        uses: ./.github/actions/test-membership
+        uses: hazelcast/hazelcast-tpm/membership@main
         with:
           organization-name: hazelcast
           member-name: ${{ github.actor }}