Doc: Pubsub scaler, document relation between stabilizationWindowSeconds and metrics sample rate

[ls-urs-keller]

keda-docs/content/docs/2.14/scalers/gcp-pub-sub.md

Line 35 in c01eb79

- `mode` - The metric used to scale your workload. It's the `PascalCase` of the official metric name. For example, if you are going to leverage the metric `subscription/pull_request_count`, you will fill the value as `PullRequestCount`. Please refer to https://cloud.google.com/monitoring/api/metrics_gcp#gcp-pubsub. All metrics starting with `subscription/` and `topic/` are supported. (Default: `SubscriptionSize`, aka `NumUndeliveredMessages`)

I'm wondering if you can document a recommendation for the value of stabilizationWindowSeconds given that the underlying pubsub metrics are sampled only every 60s and can take up to 120s to update.

Otherwise, this might unnecessarily scale to the max due to the rate at which the metric updates

[zroubalik]

@ls-urs-keller makes sense, are you willing to update docs with the details?

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