feat(api!): rename component to action on the API level

[lucaspin]

Related to #1837

---

Following #4396, we update the APIs and CLI to reflect the rename of component to action. This is a breaking change for the API. Clients will be required to update their YAMLs to work with the new API.

API

Two changes:

• The /api/v1/components no longer exists. It was replaced with /api/v1/actions.
• Referencing an action in a canvas YAML now requires you to use action field instead of the component field:

spec:
  nodes:
    - id: "component-node-70p83y"
      name: "Wait for the changes to propagate"
      type: "TYPE_ACTION"
      action:
        name: "wait"
      # ...

CLI

The superplane index components command becomes superplane index actions

[superplanehq-integration]

👋 Commands for maintainers:

• /sp start - Start an ephemeral machine (takes ~30s)
• /sp stop - Stop a running machine (auto-executed on pr close)

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