Add fallback for yaml editor

What does this MR do and why?

Add fallback for yaml editor

  • sometimes getModel returns null and the UI errors
  • add a check for this and default to *.yaml to enable validation even if getModel fails
  • ensure validation does not get put on non-policy files
  • add tests

Changelog: fixed

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Screenshots or screen recordings

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Page After
policy editor Screenshot_2025-03-11_at_13.29.01
policy.yml Screenshot_2025-03-11_at_13.29.33
other yml file image

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Related to #523898 (closed)

Edited by Alexander Turinske

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