feat: add AWS EC2 power management and get instance components

[felixgateru]

Resolves: #5006

What changed

Adds two AWS EC2 workflow components:

Get Instance — describe an EC2 instance and emit its current state, IP addresses, and metadata
Manage Instance Power — perform a power operation on an EC2 instance (start, stop, reboot, or hibernate) and wait for the expected terminal state

Why

SuperPlane already had EC2 AMI actions (create/get/copy image, etc.) and instance provisioning (create/delete), but no way to inspect a running instance mid-workflow or change its power state

How

Backend

Added GetInstance in pkg/integrations/aws/ec2/get_instance.go. Setup resolves the instance name via DescribeInstance and stores it alongside the instance ID in node metadata so the UI card shows both.
Added ManageInstancePower in pkg/integrations/aws/ec2/manage_instance_power.go with four operations: start (polls until running), stop (polls until stopped), hibernate (sends StopInstances?Hibernate=true, polls until stopped), and reboot (fire-and-forget, emits immediately since the instance stays running throughout).
Added RebootInstances and HibernateInstances (via a stopInstances helper with a Hibernate flag) to the EC2 client in pkg/integrations/aws/ec2/client.go.
Registered both components in pkg/integrations/aws/aws.go.
Added example outputs, tests, and updated ec2.go / example.go.

Frontend

Added workflow v2 mappers:
web_src/src/pages/workflowv2/mappers/aws/ec2/get_instance.ts — metadata card shows resolved instance name, raw instance ID (when a name was found), and region
web_src/src/pages/workflowv2/mappers/aws/ec2/manage_instance_power.ts — metadata card shows instance name, operation label (Start / Stop / Reboot / Hibernate), and region; execution details include the operation and final state
Registered mappers and event state registries in web_src/src/pages/workflowv2/mappers/aws/index.ts
Added mapper specs for both components (get_instance.spec.ts, manage_instance_power.spec.ts)

Demo

Screencast.From.2026-05-28.14-17-12.webm

[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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