Set a limit to the `DataPlane` number of instances handled by a single `ControlPlane`

[mlavacca]

Problem Statement

With Kong/gateway-operator-archive#607, we'll allow the ControlPlane to push the configuration to many different DataPlane instances. We need to evaluate the number of DataPlane instances the ControlPlane can handle correctly and either set a hard limit on the DataPlane replicas or document the value.

Additional information

This issue is blocked by

• [x] Kong/gateway-operator-archive#8
• [x] Kong/gateway-operator-archive#607

Acceptance Criteria

• [ ] Evaluate the number of DataPlane instances that the ControlPlane can correctly handle
• [ ] validate that the number of replicas is lower or equal to that value, or document the value to provide such information to the user.

[shaneutt]

I would suggest if we decide we want the hard limit approach, that we soften that and provide some mechanism to override it. e.g. --yes-i-know-what-im-doing-and-i-know-this-isnt-supported-just-extend-the-dataplane-limit=10000