feat: Added workflow for syncing CSV labels to GitHub Labels (Azure#1285

)

**Test Run:**
https://github.com/jtracey93/bicep-registry-modules/actions/runs/8285523952/job/22673465780

This pull request introduces a new GitHub Actions workflow in the
`.github/workflows/avm.platform.sync-repo-labels-from-csv.yml` file. The
workflow is designed to synchronize labels from a CSV file to GitHub
labels. It is scheduled to run daily at 3:45 AM PST and can also be
manually triggered. The workflow runs on an Ubuntu-latest environment
and uses a PowerShell script to perform the synchronization.

Key changes include:

* New GitHub Actions workflow: A new workflow named
`avm.platform.sync-repo-labels-from-csv` has been added. This workflow
is set to run on a schedule and can also be manually triggered.
* Concurrency settings: The workflow is configured to allow only one
concurrent deployment. If a new deployment is triggered while another
one is in progress, the in-progress deployment will be cancelled.
* Permissions: The workflow has write permissions for issues and pull
requests.
* Workflow job: The workflow contains a job named `sync-labels` that
runs on an `ubuntu-latest` environment. The job uses a PowerShell script
to synchronize labels from a CSV file to GitHub labels.

.github/workflows/avm.platform.sync-repo-labels-from-csv.yml

@@ -0,0 +1,31 @@
+# Workflow for syncing CSV labels to GitHub Labels
+name: avm.platform.sync-repo-labels-from-csv
+
+on:
+  schedule:
+    - cron: 45 11 * * * # Run daily at 3:45 AM PST
+  workflow_dispatch: {}
+
+# Allow one concurrent deployment
+concurrency:
+  group: "labels"
+  cancel-in-progress: true
+
+permissions:
+  issues: write
+  pull-requests: write
+
+defaults:
+  run:
+    shell: pwsh
+
+jobs:
+  sync-labels:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Sync AVM Labels To Repos GitHub Labels
+        run: |
+          Invoke-WebRequest -Uri "https://raw.githubusercontent.com/Azure/Azure-Verified-Modules/main/docs/static/scripts/Set-AvmGitHubLabels.ps1" -OutFile "./Set-AvmGitHubLabels.ps1"
+          ./Set-AvmGitHubLabels.ps1 -RepositoryName "${{ github.repository }}" -CreateCsvLabelExports $false -RemoveExistingLabels $false -NoUserPrompts $true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}