ResourceTabs and Events table crash if user has no permissions for event schema

[torchiaf]

Setup

• Rancher version: head-d669a7cc2a
• Rancher UI Extensions:
• Browser type & version:

Describe the bug

headerFromSchemaColString function throws undefined error if schema input field is null - for instance if a user has no permissions to fetch the event schema.
The function is used to build Events table headers;

We need to add null checks for event schema.

To Reproduce

• Log in as admin user
• Create a standard user
• Follow this guide to create a new project1 Workspace in Fleet as admin, and share it with the standard user: https://fleet.rancher.io/multi-user#isolated-workspaces-in-rancher
• As admin, create 1 or more GitRepos in project1 .
• Login as standard user
• Go to Fleet -> GitRepo -> select a GitRepo and go to details page

Result

The ResourceTab component crashes because the eventSchema is null: