docs: add request-based vs instance-based billing section to RunwayService

Gonzalo Servatrequested to merge
gservat/cloud-run-instance-based-billing into master

Adds a new Request-Based vs Instance-Based Billing section to the RunwayService docs, covering:

  • Request-based billing as the default (spec.request_based_billing: true)
  • How to enable instance-based billing and why you might want to
  • Resource limit requirements (>= 1000m CPU, >= 512Mi memory) with a caution callout

New in v4.30.0.

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