Feature: Add create_flow_run system action to automations

[zhen0]

Describe this PR

Closes #1140

[zanieb]

Are you planning on exposing some of these fields?

input create_flow_run_action_config {
    "The flow group id to create a flow run for"
    flow_group_id: UUID!
    "Optional parameters to pass to the flow run"
    parameters: JSON
    "An optional amount of time to wait before starting the flow run"
    in_seconds: Int
    "An optional name for the flow run"
    run_name: String
    "An optional list of labels for the flow run"
    labels: [String]
    "An optional key to prevent duplicate runs from being created"
    idempotency_key: String
}

[zhen0]

Are you planning on exposing some of these fields?

input create_flow_run_action_config {
    "The flow group id to create a flow run for"
    flow_group_id: UUID!
    "Optional parameters to pass to the flow run"
    parameters: JSON
    "An optional amount of time to wait before starting the flow run"
    in_seconds: Int
    "An optional name for the flow run"
    run_name: String
    "An optional list of labels for the flow run"
    labels: [String]
    "An optional key to prevent duplicate runs from being created"
    idempotency_key: String
}

These are great options but to add them would add another level of complexity to the automations UI. For this iteration I'd like to keep it simple but I've created a new ticket (#1154) for us to consider exposing these as priorities allow.

[ThatGalNatalie]

lgtm