Changing the way the "Updated by" text field is being constructed

Formatting of the reason field "Updated by ..." (Agent's last activities panel) should be changed. Right now, it is double hyperlinked.

<a id="commits:IDE-TEST-3" class="Successful" href="/browse/IDE-TEST-3/commit" >
         Updated by<a href="/browse/author/jgorycki">jgorycki</a>,   
         <a href="/browse/author/wseliga">wseliga</a>, 
         <a href="/browse/author/jjaroczynski">jjaroczynski</a>
</a>

Affected files:

• bamboo-core/src/main/resources/com/atlassian/bamboo/build/triggerReasons/codeChangedTriggerReason-short.ftl
• bamboo-web-app/src/main/webapp/fragments/buildResults/buildResultsTable.ftl

Originally raised as a part of BAM-3002. For it affects bamboo internal interfaces, on Mark request it has been moved to a separate Jira task.