fix: add agent pool + queue-id to initialise-project + ADO troubleshooting docs

[pgabriel-01]

PR Summary into Azure/mlops-v2

Checklist

I have:

• read and followed the contributing guidelines
• PR has a meaningful title
• Summarized the changes
• PR is ready to merge and NOT WORK IN PROGRESS

Changes

Three related fixes for issues users hit when running initialise-project on a freshly-provisioned Azure DevOps organization.

1. initialise-project.yml — missing agent pool

InitialiseProjectJob had no pool: block. ADO falls back to the org's default pool, which on new orgs may be unset, causing the job to fail to schedule. Added explicit:

pool:
  vmImage: ubuntu-latest

2. create_ado_pipelines.sh — missing --queue-id

az pipelines create was called without --queue-id. On newly-provisioned projects this can fail with "Could not queue the build because there were validation errors or warnings" because the default queue-to-pool association is not yet established.

Fix: resolve the queue ID dynamically by pool name before the loops:

agent_pool_name="${AGENT_POOL_NAME:-Azure Pipelines}"
queue_id=$(az pipelines queue list \
    --project "$project_name" \
    --query "[?name=='$agent_pool_name'].id | [0]" \
    -o tsv)

Both az pipelines create calls now pass ${queue_id:+--queue-id $queue_id} (the parameter is omitted gracefully if the lookup fails, preserving backward compatibility). Self-hosted pool users can override via the AGENT_POOL_NAME environment variable.

3. deployguide_ado.md — Troubleshooting section

Added a new Troubleshooting section before Next Steps in MLOps, covering the five most common failure modes reported by users:

1. No hosted parallelism granted — link to https://aka.ms/azpipelines-parallelism-request.
2. Missing "Create build pipeline" permission — Project Settings → Permissions.
3. Stale folders/repo on retry — clean-up checklist before re-running initialise-project.
4. Retired ubuntu-20.04 image — pointer to fix in mlops-project-template.
5. Queue association failure on new projects — covered by the script change above.

Testing

• bash -n .azuredevops/scripts/create_ado_pipelines.sh — syntax OK.
• ${queue_id:+--queue-id $queue_id} expansion verified to expand only when set.
• Markdown rendering verified.

Merge note

Requesting squash and merge.

Reported by Vicky Arpatzoglou via accelerator feedback (initialise-project failures, parallelism, build-pipeline permissions, stale folders, ubuntu-20.04 image).

fixes #