chore: add custom node taints

[DmitriyMV]

This PR adds support for custom node taints. Refer to nodeTaints in the configuration for more information.

Closes #7581

[DmitriyMV]

There is also

talos/internal/integration/api/node-labels.go

Lines 67 to 126 in dbaf5c6

	func (suite *NodeLabelsSuite) testUpdate(node string, isControlplane bool) {
	k8sNode, err := suite.GetK8sNodeByInternalIP(suite.ctx, node)
	suite.Require().NoError(err)
	suite.T().Logf("updating labels on node %q (%q)", node, k8sNode.Name)
	watcher, err := suite.Clientset.CoreV1().Nodes().Watch(suite.ctx, metav1.ListOptions{
	FieldSelector: "metadata.name=" + k8sNode.Name,
	Watch: true,
	})
	suite.Require().NoError(err)
	defer watcher.Stop()
	const stdLabelName = "kubernetes.io/hostname"
	stdLabelValue := k8sNode.Labels[stdLabelName]
	// set two new labels
	suite.setNodeLabels(node, map[string]string{
	"talos.dev/test1": "value1",
	"talos.dev/test2": "value2",
	})
	suite.waitUntil(watcher, map[string]string{
	"talos.dev/test1": "value1",
	"talos.dev/test2": "value2",
	}, isControlplane)
	// remove one label owned by Talos
	suite.setNodeLabels(node, map[string]string{
	"talos.dev/test1": "foo",
	})
	suite.waitUntil(watcher, map[string]string{
	"talos.dev/test1": "foo",
	"talos.dev/test2": "",
	}, isControlplane)
	// on control plane node, try to override a label not owned by Talos
	if isControlplane {
	suite.setNodeLabels(node, map[string]string{
	"talos.dev/test1": "foo2",
	stdLabelName: "bar",
	})
	suite.waitUntil(watcher, map[string]string{
	"talos.dev/test1": "foo2",
	stdLabelName: stdLabelValue,
	}, isControlplane)
	}
	// remove all Talos Labels
	suite.setNodeLabels(node, nil)
	suite.waitUntil(watcher, map[string]string{
	"talos.dev/test1": "",
	"talos.dev/test2": "",
	}, isControlplane)
	}

integration test. Should I update it to handle the taints too?

[smira]

integration test. Should I update it to handle the taints too?

yes, absolutely, probably another test which will be very similar

[smira]

lgtm, just need the integration test!

[DmitriyMV]

/m