b484ab116f
Prior to this commit, the `RestTemplate` observation instrumentation would only record `RestClientException` and `IOException` as errors in the observation. Other types of errors can be thrown by custom components, such as `ResponseErrorHandler` and in this case they aren't recorded with the observation. Also, the current instrumentation does not create any observation scope around the execution. While this would have a limited benefit as no application code is executed there, developers could set up custom components (such as, again, `ResponseErrorHandler`) that could use contextual logging with trace ids. This commit ensures that all `Throwable` are recorded as errors with the observations and that an observation `Scope` is created around the execution of the client exchange. Fixes gh-32063
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