[14349] Fix inconsistent ReaderProxy state on intra-process (backport #2626)

[mergify]

This is an automatic backport of pull request #2626 done by Mergify.
Cherry-pick of 23364f0 has failed:

On branch mergify/bp/2.3.x/pr-2626
Your branch is up to date with 'origin/2.3.x'.

You are currently cherry-picking commit 23364f0b9.
  (fix conflicts and run "git cherry-pick --continue")
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  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   src/cpp/rtps/writer/ReaderProxy.cpp
	both modified:   test/blackbox/common/BlackboxTestsPubSubBasic.cpp

no changes added to commit (use "git add" and/or "git commit -a")

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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[MiguelCompany]

@richiprosima Please test this

[MiguelCompany]

@richiprosima Please test this

[MiguelCompany]

@Mergifyio backport 2.2.x

[mergify]

backport 2.2.x

✅ Backports have been created

• #2639 [14349] Fix inconsistent ReaderProxy state on intra-process (backport #2626) (backport #2630) has been created for branch 2.2.x