aa2028127f
This commit overhauls the TestExecutionListener for Micrometer's ObservationRegistry that was introduced in the previous commit. Specifically, this commit: - Renames the listener to MicrometerObservationRegistryTestExecutionListener since the use of a ThreadLocal is an implementation detail that may change over time. - Makes the listener package-private instead of public in order to allow the team greater flexibility in evolving this feature. - Eagerly loads the ObservationThreadLocalAccessor class and verifies that it has a getObservationRegistry() method to ensure that the listener is properly skipped when SpringFactoriesLoader attempts to load it, if Micrometer 1.10.8+ is not on the classpath. - Switches the listener's automatic registration order to 2500 in order to register it after the DependencyInjectionTestExecutionListener. - Only tracks the previous ObservationRegistry in beforeTestMethod() if the test's ApplicationContext contains an ObservationRegistry bean. - Properly removes the TestContext attribute for the previous ObservationRegistry in afterTestMethod(). - Introduces DEBUG logging for diagnostics. - Adds an entry in the Javadoc for TestExecutionListener as well as in the Testing chapter in the reference manual. Closes gh-30658
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