ci: error out for invalid component in commit header

if the commit header is not present in the list of
the component we maintain. the commitlint check should
show error instead of showing the warning.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

.commitlintrc.yml

@@ -13,7 +13,7 @@ rules:
   scope-empty: [1, always]
   # valid types/prefixes, see docs/development-guide.md
   type-enum:
-    - 1
+    - 2
     - always
     - - build
       - cephfs