DOCS-4112: Document machine job scheduling functionality with JobConfig

[promptless]

Based on PR RSDK-10963, document the new machine job scheduling functionality that allows users to configure automated jobs that run on machines at specified intervals. This PR adds the JobConfig definition to the robot.proto file, enabling users to schedule recurring tasks on their machines.

New Job Scheduling Features:

• Configure jobs with unique names and scheduling intervals
• Support for both unix-cron expressions and Golang duration strings for flexible scheduling
• Target specific resources and methods for automated execution
• Optional command parameters for DoCommand-based jobs
• Integration with machine configuration through repeated JobConfig fields

Key Configuration Options:

• name: Unique identifier for each scheduled job
• schedule: Unix-cron string (e.g., "0 */6 * * *") or Golang duration (e.g., "5m", "1h") for job intervals
• resource: Target resource name for the job execution
• method: Specific gRPC method to call on the resource
• command: Optional command arguments for DoCommand-based operations

Use Cases:

• Automated data collection at regular intervals
• Periodic maintenance tasks and system checks
• Scheduled sensor readings and data logging
• Regular component status monitoring
• Automated calibration and configuration updates

The documentation should cover configuration examples, scheduling syntax, troubleshooting, and best practices for implementing reliable scheduled jobs on Viam machines. This represents a significant new capability for automating machine operations and reducing manual intervention requirements.

Trigger Events

• viamrobotics/api PR #710: RSDK-10963 Adding JobConfig definition to app/v1/robot.proto

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