Add gating tests

Resolves: #2188490

gating.yaml

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+--- !Policy
+product_versions:
+  - rhel-8
+decision_context: osci_compose_gate
+rules:
+  - !PassingTestCaseRule {test_case_name: osci.brew-build.tier0.functional}

tests/gts-smoketest/PURPOSE

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+Test Name: gts-smoketest
+Author:
+Short Description: Check the metapackage installability

tests/gts-smoketest/runtest.sh

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+#!/bin/sh
+
+set -e
+set -x
+
+# This is a metapackage.  It's main purpose is to pull other packages
+# into play via the rpm deps.
+rpm -q gcc-toolset-12
+echo
+echo RESULT: PASS

tests/tests.yml

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+---
+- hosts: localhost
+  roles:
+  - role: standard-test-basic
+    tags:
+    - classic
+    tests:
+    - gts-smoketest
+    required_packages:
+    - scl-utils