Examples fix: delete topic after endpoint (backport #3558)

[mergify]

This is an automatic backport of pull request #3558 done by Mergify.
Cherry-pick of 5f2621c has failed:

On branch mergify/bp/2.6.x/pr-3558
Your branch is up to date with 'origin/2.6.x'.

You are currently cherry-picking commit 5f2621ceb.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   examples/C++/DDS/BasicConfigurationExample/BasicConfigurationSubscriber.cpp

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   examples/cpp/dds/AdvancedConfigurationExample/AdvancedConfigurationSubscriber.cpp

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[JLBuenoLopez]

@juanlofer-eprosima, this backport has conflicts. Can you take a look and fix them? Thanks!