NSHM Unit Tests

Update how unit tests are done for NSHMs.

• New file added, nshms.yml, that defines the NSHMs that will be used for unit testing and deployments
  • Once merged the AWS deployment will be updated to see this file and deploy the NSHMs listed in the file
  • This file will become the single point of truth for what NSHMs and tags are being used
• NSHM unit tests are not run on ./gradlew test, must run them individually:
  • ./gradlew testAlaska2023
  • ./gradlew testConus2018
  • ./gradlew testConus2023
  • ./gradlew testHawaii2021
• Added separate CI/CD pipelines to run the NSHM unit tests

For #501