MiqCapacityController - remove dead copypasta from MiqPolicyController
MiqCapacityController - remove dead copypasta from MiqPolicyController

The code is clearly not supposed to be in `MiqCapacityController`:

   * has been there since the initial commit
   * it checks for `@action_type_changed`, only set in `miq_policy_controller/miq_actions.rb`
   * it checks for `@tag_selected`, only set in `tree_builder_tags_spec.rb` and `miq_policy_controller/miq_actions.rb`
   * it checks for `@snmp_trap_refresh` only set in `miq_policy_controller/miq_actions.rb`
   * it updates `action_options_div`, only defined in `app/views/miq_policy/_action_options.html.haml`
   * it checks for `@alert_refresh`, only set in `miq_policy_controller/alerts.rb`
   * it updates `alert_details_div`, only defined in `app/views/miq_policy/_alert_details.html.haml`

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