Parallel installs

[hargitayjpl]

Purpose

• Enable parallel installation of Unity components to improve bootstrap efficiency and speed
• Fix state locking issues during concurrent Terraform operations
• Simplify the installation process for multiple components

Proposed Changes

• [ADD] Created a batch installation function to process multiple applications simultaneously
• [ADD] Implemented parallel installation of Unity Proxy and API Gateway
• [ADD] Implemented parallel installation of Health Status Lambda and Unity UI
• [CHANGE] Modified Terraform backend to use S3's native locking instead of DynamoDB
• [CHANGE] Updated bootstrap flow to install components in batches
• [FIX] Resolved state locking conflicts during multiple Terraform operations

Issues

• Fixes state locking errors when trying to install multiple components
• Addresses performance bottlenecks in the bootstrap process

Testing

• Successfully deployed all components without locking errors
• Verified that uninstallation of individual components still works as expected
• All components function correctly after parallel installation