fix(clusters): hide console link and action for hub cluster (ACM-38829)

[oksanabaza]

📝 Summary

Ticket Summary (Title):
Open cluster console action and link should not appear for hub cluster

Ticket Link:
https://redhat.atlassian.net/browse/ACM-38829

Type of Change:

• 🐞 Bug Fix

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Root Cause

The feature added in ACM-36253 (console links for managed clusters) did not exclude the hub cluster (local-cluster). Two places were affected:

1. Name column icon (frontend/src/components/Clusters/ClustersTableHelper.tsx:101) — useClusterNameColumn only checked cluster.consoleURL, not whether the cluster was the hub.
2. "Open cluster console" row action (frontend/src/routes/Infrastructure/Clusters/ManagedClusters/utils/cluster-actions.ts:131) — clusterSupportsAction for OpenConsole only checked !!cluster.consoleURL.

Since the hub cluster has a real consoleURL, both the link icon and the action always appeared for it.

Fix

• Added optional localHubName?: string parameter to clusterSupportsAction. The OpenConsole case now returns false when cluster.name === localHubName.
• ClusterActionDropdown passes its already-fetched localHubName to clusterSupportsAction.
• useClusterNameColumn accepts an optional localHubName parameter and skips rendering the console link icon for the hub cluster. useTableColumns (which already had localHubName) passes it down.

How to test

1. npm run setup (if not already done)
2. npm run plugins — navigate to Infrastructure → Clusters
3. With a hub cluster (local-cluster) visible in the list:
   • Expected: No external link icon next to the hub cluster name
   • Expected: No "Open cluster console" option in the hub cluster's actions kebab menu
4. Verify the link icon and action still appear for non-hub managed clusters with a console URL

✅ Checklist

General

• PR title follows the convention
• Code builds and runs locally without errors
• No console logs, commented-out code, or unnecessary files
• All commits are meaningful and well-labeled
• All new display strings are externalized for localization (English only)

If Bugfix

• Root cause and fix summary are documented in the ticket (for future reference / errata)
• Fix tested thoroughly and resolves the issue
• Test(s) added to prevent regression

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🗒️ Notes for Reviewers

Three minimal changes across two source files. The localHubName is already available in both call sites (ClusterActionDropdown fetches it via useLocalHubName(); useTableColumns already received it as a prop). No new state or hooks were introduced.