Remove cli requirement for existing path, allow configuration rules without "step"

[oharan2]

Main changes:

1. Remove strict Click requirement for Firewatch config path to be an existing file
   • The cli accepts URLs
2. Allow the Firewatch configuration to include rules without "step"
   • Example:

   "success_rules":
    [
      {"jira_project": "PROJECT", "jira_additional_labels": ["!default"]}
    ]
   

[redhat-qe-bot]

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[oharan2]

/verified

[calebevans]

/lgtm