Probe every access review connector on status check

Bad API keys and expired OAuth tokens showed Connected because
probes ran only for OAuth2 and many providers had no ProbeURL.
Add a registry ProbeConnection dispatcher with static, dynamic,
and custom probes so all 41 providers are checked on demand.

Signed-off-by: Bryan Frimin <bryan@probo.com>

pkg/connector/provider/metabase.go

@@ -32,6 +32,7 @@ func metabaseRegistration() *Registration {
 		DisplayName:    "Metabase",
 		SupportsAPIKey: true,
 		APIKeyHeader:   "x-api-key",
+		BuildProbeURL:  buildMetabaseProbeURL,
 		ExtraSettings: []ExtraSetting{
 			{Key: "instanceUrl", Label: "Instance URL", Required: true},
 		},