Fix global read-write lock handling when not declared on top level

[marcphilipp]

Overview

Prior to this change additional locks were not cleared from siblings
when discovering the global read-write lock on a test descriptor which
led to incompatible locks and caused test execution to fail.

Fixes #4027.

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Definition of Done

• There are no TODOs left in the code
• Method preconditions are checked and documented in the method's Javadoc
• Coding conventions (e.g. for logging) have been followed
• Change is covered by automated tests including corner cases, errors, and exception handling
• Public API has Javadoc and @API annotations
• Change is documented in the User Guide and Release Notes