Add yamls for metrics-based-autoscaling user guide.

[pawloch00]

Description

This PR introduces yamls used by user guide for setting up metrics-based autoscaling with slurm-operator and keda on GKE.

Tasks

• The contributing guide has been read and followed.
• The samples added / modified have been fully tested.
• Workflow files have been added / modified, if applicable.
• Region tags have been properly added, if new samples.
• Editable variables have been used, where applicable.
• All dependencies are set to up-to-date versions, as applicable.
• Merge this pull-request for me once it is approved.

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• ai-ml/gke-slurm/metrics-autoscaling/autoscaling-metrics.yaml:15, tag gke_ai_ml_gke_slurm_metrics_autoscaling_keda
• ai-ml/gke-slurm/metrics-autoscaling/pv-pvc.yaml:15, tag gke_ai_ml_gke_slurm_metrics_autoscaling_pv_pvc
• ai-ml/gke-slurm/metrics-autoscaling/values.yaml:15, tag gke_ai_ml_gke_slurm_metrics_autoscaling_values

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[NimJay]

Thanks for these samples!

I trust that these manifests have been tested adequately.
Approved.

[NimJay]

Issue:
The region tags need to be closed (i.e., we need [END gke_ai_ml_gke_slurm_metrics_autoscaling] at the bottom of this file).
This applies to all files.

ai-ml/gke-slurm/metrics-autoscaling/autoscaling-metrics.yaml:15, tag gke_ai_ml_gke_slurm_metrics_autoscaling doesn't have a matching end tag.
ai-ml/gke-slurm/metrics-autoscaling/pv-pvc.yaml:15, tag gke_ai_ml_gke_slurm_metrics_autoscaling doesn't have a matching end tag.
ai-ml/gke-slurm/metrics-autoscaling/values.yaml:15, tag gke_ai_ml_gke_slurm_metrics_autoscaling doesn't have a matching end tag.

[NimJay]

Issue: We need to use distinct region tags for each file.

[NimJay]

This internal page might be helpful: go/code-snippets-101#code-snippet-anatomy