Ensure that chat agent produces correct links

[marians]

So far we see cases where the agent invents URLs.

Our skill file on portal URL structure isn't always read, and when read it isn't always obeyed.

[marians]

Some test prompts:

• Are there any unhealthy clusters in graveler?
• Please check what workload clusters we have in the graveler MC

Should show the use of generatePortalUrl for the cluster details page URL