Matthew Jacobson 9f9c4b3da3 Alerting: Template preview enhancements (#103817)
API Changes:

- Fixes validation in template CRUD API to be closer to how the running 
  alertmanager will use the template. Should remove some incorrect 
  validation errors.

- Adds some missing default placeholder labels to receiver testing that 
  are used during template testing but missing during receiver testing


Template Preview:

- Replaced basic preview with a readonly CodeEditor for better whitespace 
  and alignment clarity (also adds support for future syntax highlighting 
  in template previews for upcoming webhook payload templates)

Template Selector (Receiver Form):

- Refactored to use same components as Template editor for preview.
- Fixed preview to work with multi-definition templates
- Fixed copy to correctly copy the template contents instead of 
  {{ template "<name>" . }}.

Template Editor:

- Fixed detection of when to display functions vs snippets in multi-line 
  expressions
2025-04-11 09:27:19 -04:00
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