feat: support dedicated host ec2 overrides

[edersonbrilhante]

Description

Adds support for applying supported dynamic EC2 override labels to dedicated-host runner launches that use RunInstances.

This maps the parsed ec2OverrideConfig into the RunInstances request for supported fields:

• InstanceType
• SubnetId
• ImageId
• Placement
• BlockDeviceMappings

Fleet-only override fields such as InstanceRequirements, MaxPrice, Priority, and WeightedCapacity are intentionally not forwarded to RunInstances.

Also updates the dynamic label documentation to show which EC2 override labels work with EC2 Fleet and which work with dedicated-host launches.

Test Plan

• Added unit test coverage for dedicated-host RunInstances overrides.
• Verified supported EC2 override config values are passed to RunInstances.
• Verified Fleet-only fields are not passed to RunInstances.
• Ran yarn exec vitest run functions/control-plane/src/aws/runners.test.ts --config functions/control-plane/vitest.config.ts
• Ran yarn exec eslint functions/control-plane/src/aws/runners.ts functions/control-plane/src/aws/runners.test.ts
• Ran yarn workspace @aws-github-runner/control-plane build
• Ran git diff --check

Related Issues

N/A

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None