Update Testing framework to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
xunit.v3.core.mtp-v2	3.2.2 → 4.0.0
xunit.v3.mtp-v2	3.2.2 → 4.0.0

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Pull request overview

This PR updates the centralized test runner package versions used by the repository’s xUnit v3 + Microsoft.Testing.Platform (MTP v2) setup, moving to the new major release of the xunit.v3.*mtp-v2 packages.

Changes:

• Bump xunit.v3.core.mtp-v2 from 3.2.2 to 4.0.0.
• Bump xunit.v3.mtp-v2 from 3.2.2 to 4.0.0.

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