Re-add out id to Console Output (jenkinsci#25953)

Partially reverts 331c768.

In jenkinsci#8960 the `out` id was added to `pre.console-output`'s  "otherwise"
case in `console.jelly`.

In 331c768, the `out` id was removed from `otherwise` when console output
was moved from `console.jelly` to `console-log.jelly`.

This may have broken the "Copy" button in some instances.

When clicked, the copy button will copy the inner text of a container
with the id referred to by the `ref` attribute of the copy button. The
copy button's ref attribute is `out`.

Wikimedia's Jenkins has no element with the `out` id on the console
page, which leads to copying `null` to the clipboard.

This was filed as https://phabricator.wikimedia.org/T410633.

Co-authored-by: Mark Waite <[email protected]>

Author: thcipriani

core/src/main/resources/hudson/model/Run/console-log.jelly

@@ -29,7 +29,7 @@
     </j:when>
     <!-- output is completed now. -->
     <j:otherwise>
-      <pre class="console-output">
+      <pre id="out" class="console-output">
         <st:getOutput var="output" />
         <j:whitespace>${it.writeLogTo(offset,output)}</j:whitespace>
       </pre>