feat: improve ci performance

split all pre-commit checks into individual workflows, so that
woodpecker spawns a container/job for each. this vastly improves the
time it takes for CI to complete checks for puppet

- create per-pre-commit-check pre-commit config files
- create per-pre-commit-check woodpecker workflows

.woodpecker/epp-validate.yaml

@@ -0,0 +1,8 @@
+when:
+  - event: pull_request
+
+steps:
+  - name: epp-validate
+    image: git.unkin.net/unkin/almalinux9-puppet-pr-validator:20260317
+    commands:
+      - uvx pre-commit run --all-files --config ci/epp-validate.yaml