cmd/k8s-operator: remove configuration knob for Connector (#10791)

The configuration knob (that defaulted to Connector being disabled)
was added largely because the Connector CRD had to be installed in a separate step.
Now when the CRD has been added to both chart and static manifest, we can have it on by default.

Updates tailscale/tailscale#10878

Signed-off-by: Irbe Krumina <irbe@tailscale.com>

cmd/k8s-operator/deploy/manifests/operator.yaml

@@ -286,8 +286,6 @@ spec:
                       valueFrom:
                         fieldRef:
                             fieldPath: metadata.namespace
-                    - name: ENABLE_CONNECTOR
-                      value: "false"
                     - name: CLIENT_ID_FILE
                       value: /oauth/client_id
                     - name: CLIENT_SECRET_FILE