chore: sync PR template types with linter config

Add missing conventional commit types (style, perf, test, build, ci,
revert) to the PR template to match the linter regex in
.tekton/linter.yaml. Remove non-standard 'enhance' type that would
fail CI validation.

Signed-off-by: Zaki Shaikh <zashaikh@redhat.com>
Assisted-by: Claude Opus 4.6 (via Claude Code)

Author: zakisk

.github/pull_request_template.md

@@ -17,9 +17,14 @@ Fixes #
 - [ ] ✨ New feature (`feat:`)
 - [ ] 💥 Breaking change (`feat!:`, `fix!:`)
 - [ ] 📚 Documentation update (`docs:`)
-- [ ] ⚙️ Chore (`chore:`)
+- [ ] 🎨 Style (`style:`)
 - [ ] 💅 Refactor (`refactor:`)
-- [ ] 🔧 Enhancement (`enhance:`)
+- [ ] ⚡ Performance (`perf:`)
+- [ ] ✅ Test (`test:`)
+- [ ] 🏗️ Build (`build:`)
+- [ ] 👷 CI (`ci:`)
+- [ ] ⚙️ Chore (`chore:`)
+- [ ] ⏪ Revert (`revert:`)
 - [ ] 📦 Dependency update (`deps:`)
 
 ## 🧪 Testing Strategy