[21900] Fix DataReaderHistory regression (backport #5327)

[mergify]

Description

PR #5182 introduced a regression that was not detected since we don't have a CI that builds on Debug mode.

The changes on said PR assumed that a change in the owner of an instance when processing an incoming change would only be due to the change coming from a writer with a bigger strength.

But if the change has an Unregister status, the owner would obviously change to a writer different from the incoming change.

This PR converts the assertion on an additional condition to the if that decides whether to remove changes from other writers.

@Mergifyio backport 3.0.x 2.14.x 2.10.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

  • The ASAN job is showing the regression in the logs, so it is considered enough. I run a manual one here

• N/A: 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 backport compatible: they do NOT break ABI nor change library core behavior.

• 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.
• If this is a critical bug fix, backports to the critical-only supported branches have been requested.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.

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This is an automatic backport of pull request #5327 done by [Mergify](https://mergify.com).