feat(ec2): add dedicated host and dynamic label support

[edersonbrilhante]

Description

Adds EC2 runner support for the 7.7.0 runner module changes.

This change:

• Updates EC2 runner module wiring to use 7.7.0 of terraform-aws-github-runner.
• Adds tenant-level enable_dynamic_labels support for EC2 runners.
• Adds per-runner use_dedicated_host configuration for dedicated-host/macOS runner pools.
• Parameterizes the Lambda ZIP download script so artifacts can be downloaded from the configured runner module repo.
• Updates tenant templates, example configs, and deployment docs with ec2_config, dynamic label, and macOS dedicated-host guidance.
• Regenerates module READMEs with updated provider versions and input documentation.

Compare: main...ec2-pre-7.7.0

Type of Change

• Bug Fix
• New Feature
• Breaking Change
• Refactor
• Documentation
• Other (please describe): Generated Terraform module README updates

Checklist

• I have read the contributing guidelines
• Existing issues have been referenced (where applicable)
• I have verified this change is not present in other open pull requests
• Functionality is documented
• All code style checks pass
• New code contribution is covered by automated tests
• All new and existing tests pass

[artemburlaka]

LGTM