Split the Edit option of alerting policies into multiple options

[patrickluoyu]

Alerting policies provide only one Edit option, while all other resources provide multiple options such as Edit Information, Edit Settings, Edit YAML, Edit External Access, etc.

The user interface should follow consistent rules and maybe Edit YAML is necessary for advanced users.

[patrickluoyu]

/assign @zryfish @VioZhang @harrisonliu5