Remove maxMs limit from LatencyPlugin schema

[garrytrinder]

Raised from #1466

We don't have any logic in the LatencyPlugin that sets the maxMs to 10 seconds, but we have this set in the schema, we should remove the limit.

dev-proxy/schemas/v2.0.0/latencyplugin.schema.json

Lines 15 to 20 in bb09f96

	"maxMs": {
	"type": "integer",
	"minimum": 0,
	"maximum": 10000,
	"description": "The maximum amount of delay (in milliseconds) added to a request. Max value is 10000 (10 seconds). Default: 5000."
	}