Fix license header and always run license check (apache#6222)

Motivation

Fix the license check errors.

* Fix license header
* Always run license check

.asf.yaml

@@ -16,6 +16,7 @@
 # specific language governing permissions and limitations
 # under the License.
 #
+
 github:
   description: "Apache Pulsar - distributed pub-sub messaging system"
   homepage: https://pulsar.apache.org/

.github/workflows/ci-license.yaml

@@ -34,29 +34,19 @@ jobs:
       - name: checkout
         uses: actions/checkout@v1
 
-      - name: Check if this pull request only changes documentation
-        id:   docs
-        uses: apache/pulsar-test-infra/diff-only@master
-        with:
-          args: site2 .github deployment .asf.yaml
-
       - name: Set up JDK 1.8
         uses: actions/setup-java@v1
-        if: steps.docs.outputs.changed_only == 'no'
         with:
           java-version: 1.8
 
       # license check fails with 3.6.2 so we have to downgrade
       - name: Set up Maven
         uses: apache/pulsar-test-infra/setup-maven@master
-        if: steps.docs.outputs.changed_only == 'no'
         with:
           maven-version: 3.6.1
 
       - name: build and check license
-        if: steps.docs.outputs.changed_only == 'no'
         run: mvn -B -ntp -DskipTests license:check install
 
       - name: license check
-        if: steps.docs.outputs.changed_only == 'no'
         run: src/check-binary-license ./distribution/server/target/apache-pulsar-*-bin.tar.gz