Add a test for 'Change log level on the fly without restart '

[denis-tingaikin]

TODO:

1. Add a new README.md file into the features suite: https://github.com/networkservicemesh/deployments-k8s/tree/main/examples/features
2. Add a step to change log level for the nsmgr/fforwarder via sginal (just use kubectl exec for the nsm app in the nsm-system namespace, note: SIGUSR1, SIGUSR2 should be used).
3. Make sure that logs level is changing (kubectl logs --since=1m can be used).
4. Contribute the example.

[arp-est]

Hi, I've two prs for this,
#12572
and networkservicemesh/integration-k8s-kind#1043,
In the second pr, since I'm fiddling with the forwarder daemonset in the tc, to ensure the loglevel is not TRACE,
I've added the test to the 'WithRunningTestsSynchronously' part, to make sure that it does not interfere with the other test runs.

Please review when you have time.