feat: initial specs for ingest management

e2e/_suites/ingest-manager/features/ingest_manager.feature

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+@ingest
+Feature: Ingest Manager
+  Scenarios for the ingest manager application, considering the deployment, start, stop, enrollment, un-enrollment and enrollment of an agent.
+
+@enroll
+Scenario: Deploying an agent
+  Given the "Fleet" Kibana setup has been executed
+  When an agent is deployed to Fleet
+  Then the agent is listed in Fleet as online
+    And system package dashboards are listed in Fleet
+    And there is data in the index
+
+@start-agent
+Scenario: Starting the agent starts backend processes
+  When an agent is deployed to Fleet
+  Then "filebeat" is "started" on the host
+    And "metricbeat" is "started" on the host
+
+@stop-agent
+Scenario: Stopping the agent stops backend processes
+  Given an agent is deployed to Fleet
+  When the agent is "stopped" on the host
+  Then "filebeat" is "stopped" on the host
+    And "metricbeat" is "stopped" on the host
+
+@unenroll
+Scenario: Un-enrolling an agent
+  Given an agent is deployed to Fleet
+  When the agent is un-enrolled
+  Then the agent is not listed as online in Fleet
+    And there is no data in the index
+
+@reenroll
+Scenario: Re-enrolling an agent
+  Given an agent is enrolled
+    And the agent is un-enrolled
+    And "the agent" is "stopped" on the host
+  When the agent is re-enrolled on the host
+    And "the agent" is "started" on the host
+  Then "the agent" is listed in Fleet as online
+    And there is data in the index
+
+@revoke-token
+Scenario: Revoking the enrollment token for an agent
+  Given an agent is enrolled
+  When the enrollment token is revoked
+  Then an attempt to enroll a new agent fails