Avoid multiple class-level annotation lookups

[marcphilipp]

Overview

Instead of looking up annotations on the declaring and all enclosing
classes for each test method, each ResourceLockAware test descriptor
now delegates to the ExclusiveResourceCollector of its ancestors which
cache the class-level annotations and ResourceLocksProvider instances.

Resolves #2677.

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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