Add fallback for to_yaml method

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The following discussion from !149338 (merged) should be addressed:

• @arfedoro started a discussion: (+1 comment)

  thought (non-blocking) 🤔

  Since policyToYaml uses safeDump from js-yaml package, do you think we need to wrap it in try catch block?

Implementation plan

• wrap policyToYaml call in try/catch block and return the default yaml in the catch block in all editor_component.vue components in ee/app/assets/javascripts/security_orchestration/components/policy_editor