Add CI-legacy-g2 and CI-legacy-g2-genai caller workflows

Two new CI workflows for the legacy-g2 TAP test group:
- CI-legacy-g2: runs against ubuntu22-tap build (standard)
- CI-legacy-g2-genai: runs against ubuntu24-tap-genai-gcov build
  (PROXYSQLGENAI=1, WITHGCOV=1, with coverage report upload)

Both use SKIP_CLUSTER_START=1 and TAP_USE_NOISE=1.
Reusable workflows are on the GH-Actions branch.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/CI-legacy-g2-genai.yml

@@ -0,0 +1,19 @@
+name: CI-legacy-g2-genai
+run-name: '${{ github.event.workflow_run && github.event.workflow_run.head_branch || github.ref_name }} ${{ github.workflow }} ${{ github.event.workflow_run && github.event.workflow_run.head_sha || github.sha }}'
+
+on:
+  workflow_dispatch:
+  workflow_run:
+    workflows: [ CI-trigger ]
+    types: [ in_progress ]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.workflow_run && github.event.workflow_run.head_branch || github.ref_name }}
+  cancel-in-progress: true
+
+jobs:
+  run:
+    uses: sysown/proxysql/.github/workflows/ci-legacy-g2-genai.yml@GH-Actions
+    secrets: inherit
+    with:
+      trigger: ${{ toJson(github) }}

.github/workflows/CI-legacy-g2.yml

@@ -0,0 +1,19 @@
+name: CI-legacy-g2
+run-name: '${{ github.event.workflow_run && github.event.workflow_run.head_branch || github.ref_name }} ${{ github.workflow }} ${{ github.event.workflow_run && github.event.workflow_run.head_sha || github.sha }}'
+
+on:
+  workflow_dispatch:
+  workflow_run:
+    workflows: [ CI-trigger ]
+    types: [ in_progress ]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.workflow_run && github.event.workflow_run.head_branch || github.ref_name }}
+  cancel-in-progress: true
+
+jobs:
+  run:
+    uses: sysown/proxysql/.github/workflows/ci-legacy-g2.yml@GH-Actions
+    secrets: inherit
+    with:
+      trigger: ${{ toJson(github) }}