Revert "Replace tj-actions/changed-files with dorny/paths-filter"

[wadells]

Reverts #189.

Callers need additional permissions (read: pull-request) or they'll fail with the following signature:

https://github.com/gravitational/cloud-terraform/actions/runs/7091297245/job/19300146222?pr=3784

Fetching list of changed files for PR#3784 from Github API
  Invoking listFiles(pull_number: 3784, per_page: 100)
Error: Resource not accessible by integration

Rolling back for now. I'll look at updating call sites and then rolling back forward.

This is because dorny/paths-filter uses the github api to read diffs instead of tj-actions using the git history of the local checkout. At least that is what my initial research suggests.