KIL-2397 Agent: implement auto update support

[mrostan]

Added a new endpoint: /api/v1/upgrade that triggers the updater registered for the current platform, if any.
Here an example request:

{
    "trace_id": "1234",
    "image": "montecarlodata/pre-release-agent:0.0.1rc202-cloudrun",
    "timeout": 90
}

The upgrade for CloudRun is implemented using the CloudRun API documented here:

• Gets the service by using ServicesClient.get_service
• Updates the image in the first container (that is supposed to be the only one for CloudRun services)
• Performs the update by calling ServicesClient.update_service

[linear]

KIL-2397 Agent: implement auto-update support

Why should we make this change?

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