feat: Scoped solution tests

[MichaelThamm]

Issue

Fixes #454

Solution

This uses https://github.com/dorny/paths-filter to determine which product has changed. This project is mature, but we could replace this with bash logic if we want. This change features:

• Each product only triggers its own solution tests
  • E.g., COS Lite changes will not trigger COS or COS Dev solution tests.
• In addition to the TF changes per product, we want to run solution tests for all products on changes to:
  • '.github/workflows/terraform.yml'
  • '.github/workflows/_integration.yml'
  • 'tests/integration/conftest.py'
  • 'tests/integration/helpers.py'
• Manually triggering the solution tests, runs all.

Checklist

• I have added or updated relevant documentation.
• PR title makes an appropriate release note and follows conventional commits syntax.
• Merge target is the correct branch, and relevant tandem backport PRs opened.
• This PR has Terraform product changes and appropriate lifecycle args and moved blocks were added to the terraform/*/upgrades.tf file(s).
• This PR has breaking changes to the product API(s) and I have created an issue in SolQA pipelines to address this.

Context

This requires a backport to track/3.0

Testing Instructions

Upgrade Notes