Terminate management receive loop when idle

Applications are likely to configure their topology when they start and
modify it sporadically at best during the application lifetime.
Terminating the receive loop saves a thread.

There is now a dedicated, non-configurable thread pool for management
instances.

(cherry picked from commit abb53e3)

Author: rabbitmq-ci

0.1.0-SNAPSHOT/htmlsingle/index.html

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 <h1>RabbitMQ AMQP 1.0 Java Client</h1>
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 <span id="revnumber">version 0.1.0-SNAPSHOT</span>
-<br><span id="revremark">(833672d)</span>
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 Version 0.1.0-SNAPSHOT<br>
-Last updated 2024-09-04 09:24:24 UTC
+Last updated 2024-09-04 15:20:06 UTC
 </div>
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snapshot/htmlsingle/index.html

@@ -655,7 +655,7 @@
 <h1>RabbitMQ AMQP 1.0 Java Client</h1>
 <div class="details">
 <span id="revnumber">version 0.1.0-SNAPSHOT</span>
-<br><span id="revremark">(833672d)</span>
+<br><span id="revremark">(114da37)</span>
 </div>
 <div id="toc" class="toc2">
 <div id="toctitle">Table of Contents</div>
@@ -2213,7 +2213,7 @@ <h4 id="observability-metrics-publish-observation"><a class="anchor" href="#obse
 <div id="footer">
 <div id="footer-text">
 Version 0.1.0-SNAPSHOT<br>
-Last updated 2024-09-04 09:24:24 UTC
+Last updated 2024-09-04 15:20:06 UTC
 </div>
 </div>
 </body>