Optionally constrain to connected, approved compute nodes when selecting/ranking them

[rossjones]

When ranking jobs to send a job to, exclude those that are not connected or not approved. By defaults nodes MUST be both approved and connected, but we have added options to the NodeSelector (in the form of orchestrator.NodeSelectionCriteria) to allow for explicit specification of whether we want them to be approved/connected.

# Show top matching approved nodes whether they are connected 
# or not 
selectedNodes, err := b.nodeSelector.TopMatchingNodes(
	ctx,
	job,
	len(execs),
	&orchestrator.NodeSelectionConstraints{
		RequireApproval:  true,
		RequireConnected: false,
	},
)

To make this workable, we change the default node state to APPROVED, requiring aconfig-option to rely on manual approval - it is this way around to ensure there is no required change for users upgrading to use this feature until they are ready to enforce it.

# Require manual node approval (not default)
node:
    requester:
        manualnodeapproval: true

# Do not require manual node approval (default)
node:
    requester:
        manualnodeapproval: false

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