ARTEMIS-6165 start/stop button on lock coordinators

[clebertsuconic]

co-authored with Claude

[clebertsuconic]

@andytaylor I did this change by using Claude. it would be nice to have the button after we merge ARTE4MIS-6163. Don't know if you can think of a better way.

[grgrzybek]

Looks good - and thanks for the missing <Th> ;)

[brusdev]

LGTM — I did a brief test with FileBasedLockManager.

Outside the scope of this PR, it might be worth making the lock coordinators table visible upfront. That way, users know the feature is available, and we avoid sudden UI changes in the status section due to the config.

      <lock-coordinators>
         <lock-coordinator name="demo-lock-coordinator"
                           auto-start="true">
            <class-name>org.apache.activemq.artemis.lockmanager.file.FileBasedLockManager</class-name>
            <check-period>5000</check-period>
            <properties>
               <property key="locks-folder" value="${artemis.instance}/data/lock-coordinator"/>
            </properties>
         </lock-coordinator>
      </lock-coordinators>