test(e2e): add GCP dynamic host catalog e2e tests (#5294)

* test(e2e): add GCP infra resources and tests for enos testing

- add 1 new `gcp_target` module that creates a GCP VM instance with labels for filtering
- add GCP dynamic host catalog e2e tests

.github/workflows/enos-run.yml

@@ -80,6 +80,7 @@ jobs:
           - filter: 'e2e_database'
           - filter: 'e2e_docker_base builder:crt'
           - filter: 'e2e_docker_base_plus builder:crt'
+          - filter: 'e2e_docker_base_with_gcp builder:crt'
           - filter: 'e2e_docker_base_with_vault builder:crt'
           - filter: 'e2e_docker_base_with_worker builder:crt'
           - filter: 'e2e_docker_worker_registration_controller_led builder:crt'
@@ -101,6 +102,10 @@ jobs:
       ENOS_VAR_boundary_docker_image_name: ${{ inputs.docker-image-name }}
       ENOS_VAR_boundary_docker_image_file: ./support/boundary_docker_image.tar
       ENOS_VAR_go_version: ${{ inputs.go-version }}
+      ENOS_VAR_gcp_project_id: ${{ secrets.GCP_PROJECT_ID_CI }}
+      ENOS_VAR_gcp_client_email: ${{ secrets.GCP_CLIENT_EMAIL_CI }}
+      ENOS_VAR_gcp_private_key_id: ${{ secrets.GCP_PRIVATE_KEY_ID_CI }}
+      ENOS_VAR_gcp_private_key: ${{ secrets.GCP_PRIVATE_KEY_CI }}
     steps:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
@@ -147,6 +152,17 @@ jobs:
           role-to-assume: ${{ secrets.AWS_ROLE_ARN_CI }}
           role-skip-session-tagging: true
           role-duration-seconds: 3600
+      - name: Configure GCP credentials
+        if: contains(matrix.filter, 'gcp')
+        id: gcp_auth
+        uses: google-github-actions/auth@55bd3a7c6e2ae7cf1877fd1ccb9d54c0503c457c # v2.1.2
+        with:
+          credentials_json: ${{ secrets.GCP_CREDENTIALS }}
+          access_token_lifetime: '3600s'
+          project_id: ${{ secrets.GCP_PROJECT_ID_CI }}
+      - name: 'Set up GCP Cloud SDK'
+        if: contains(matrix.filter, 'gcp')
+        uses: google-github-actions/setup-gcloud@98ddc00a17442e89a24bbf282954a3b65ce6d200 # v2.1.0
       - name: Set up Enos
         uses: hashicorp/action-setup-enos@v1    # TSCCR: loading action configs: failed to query HEAD reference: failed to get advertised references: authorization failed
         with: