IndexSet Templates UI

[AntonEbel]

To dos

• [x] remove legacy default configuration
• [x] add index set template tab
• [x] https://github.com/Graylog2/graylog2-server/pull/19381
• [x] add action to set default template
• [x] add built-in label
• [x] add default label
• [ ] Adjust/add E2E tests
• [ ] Validate index set template form on submit in the backend (and display error per field)

UI Description

• Index sets page has a new tab to manage Index Set templates
• On Index Set templates tab we show
  • a data table listing the configuration profiles with
    • template name
    • template description
    • indicate whether it's the default template
    • indicate whether it's a prebuilt template
    • actions for each entry (edit, copy, delete, set default)
      • When copying a template it opens the edit view of that template
  • A button to create a new profile
    • clicking the button leads to a form to create a new index set template (easiest to reuse existing form?)
    • The form is validated when clicking save/create
• When creating a new index set the flow incorporates selecting a template

Screenshots for context

Restrictions:

• built-in templates cannot be selected as default
• built-in templates cannot be deleted
• default template cannot be deleted

[grotlue]

@shawnbranstetter Will prepare some screens for the UI.