[20933] Set DataSharing in Writer|ReaderProxyData (backport #4761)

[mergify]

Description

Previously, Writer|ReaderProxyData always reported DataSharing as AUTO. This PR set it to ON or OFF based on the PID_DATASHARING.

@Mergifyio backport 2.14.x 2.13.x 2.10.x 2.6.x

Contributor Checklist

• Commit messages follow the project guidelines.

• The code follows the style guidelines of this project.

• Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added; the added tests pass locally

• Any new/modified methods have been properly documented using Doxygen.

• N/A Any new configuration API has an equivalent XML API (with the corresponding XSD extension)

• Changes are ABI compatible.

• Changes are API compatible.

• N/A New feature has been added to the versions.md file (if applicable).

• N/A New feature has been documented/Current behavior is correctly described in the documentation.

• Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
• The title and description correctly express the PR's purpose.
• Check contributor checklist is correct.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.

---

This is an automatic backport of pull request #4761 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 904c523 has failed:

On branch mergify/bp/2.6.x/pr-4761
Your branch is up to date with 'origin/2.6.x'.

You are currently cherry-picking commit 904c52302.
  (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:   src/cpp/fastdds/core/policy/QosPoliciesSerializer.hpp
	modified:   src/cpp/rtps/builtin/data/ReaderProxyData.cpp
	modified:   src/cpp/rtps/builtin/data/WriterProxyData.cpp

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   test/unittest/rtps/builtin/BuiltinDataSerializationTests.cpp

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

[Mario-DL]

LGTM unrelated failed tests