Extend log-level commands to support managed clusters

[AdamSadek]

Extended all log-level commands (set, show, unset) to support managed clusters as requested in issue #41. Added optional parameters --namespace, --clusterName, and --clusterType to enable log level management in both ClusterAPI and SveltosCluster managed clusters using clusterproxy.GetKubernetesClient. Maintains full backward compatibility with existing management cluster functionality.

I first created the test cluster and then ran the actual deployment.

Examples of testing

Some new unit tests passsing:

$ go test ./internal/commands/loglevel/... -v
=== RUN   TestCollectLogLevelConfigurationFromClient_Empty
--- PASS: TestCollectLogLevelConfigurationFromClient_Empty (0.00s)
=== RUN   TestCollectLogLevelConfigurationFromClient_Existing  
--- PASS: TestCollectLogLevelConfigurationFromClient_Existing (0.00s)
=== RUN   TestUpdateLogLevelConfigurationWithClient_Create
--- PASS: TestUpdateLogLevelConfigurationWithClient_Create (0.00s)
=== RUN   TestUpdateLogLevelConfigurationWithClient_Update
--- PASS: TestUpdateLogLevelConfigurationWithClient_Update (0.00s)
=== RUN   TestShowLogSettingsInManaged
--- PASS: TestShowLogSettingsInManaged (0.00s)
=== RUN   TestUnsetDebuggingConfigurationInManaged
--- PASS: TestUnsetDebuggingConfigurationInManaged (0.00s)
PASS
ok      github.com/projectsveltos/sveltosctl/internal/commands/loglevel    0.123s

Management Cluster Tests (Backward Compatibility):

$ ./sveltosctl log-level show
+-----------+-----------+
| COMPONENT | VERBOSITY |
+-----------+-----------+
+-----------+-----------+

$ ./sveltosctl log-level set --component=SveltosAgent --debug

$ ./sveltosctl log-level show
+--------------+---------------+
|  COMPONENT   |   VERBOSITY   |
+--------------+---------------+
| SveltosAgent | LogLevelDebug |
+--------------+---------------+

$ ./sveltosctl log-level unset --component=SveltosAgent

$ ./sveltosctl log-level show
+-----------+-----------+
| COMPONENT | VERBOSITY |
+-----------+-----------+
+-----------+-----------+

Managed cluster tests

$ kubectl apply -f test-simple-adam.yaml
sveltoscluster.lib.projectsveltos.io/test-cluster created

$ kubectl get sveltosclusters -A
NAMESPACE      NAME           READY   VERSION
mgmt           mgmt           true    v1.29.1
test-cluster   test-cluster

$ ./sveltosctl log-level set --component=SveltosAgent --info \
  --namespace=test-cluster --clusterName=test-cluster --clusterType=Sveltos
# Command accepts parameters and attempts cluster connection (expected behavior)
# There are no "unknown flag" errors

For managed clusters

# SveltosCluster
./sveltosctl log-level set --component=SveltosAgent --info \
  --namespace=test-cluster --clusterName=test-cluster --clusterType=Sveltos

# ClusterAPI cluster  
./sveltosctl log-level show \
  --namespace=default --clusterName=workload-cluster --clusterType=Capi